Schedule of Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified
|
3 Months Ended |
Mar. 31, 2013
|
Debt Face Amount |
$ 3,244,366
|
|
Carrying Value |
3,240,751
|
|
CDO IV Bonds Payable
|
|
|
Month Issued |
Mar 2004
|
[1] |
Debt Face Amount |
71,604
|
[1] |
Carrying Value |
71,537
|
[1] |
Final Stated Maturity |
Mar 2039
|
[1] |
Unhedged Weighted Average Funding Cost |
1.93%
|
[1],[2] |
Weighted Average Funding Cost |
5.08%
|
[1],[3] |
Weighted Average Maturity (Years) |
1 year 2 months
|
[1] |
Face Amount of Floating Rate Debt |
60,804
|
[1] |
Outstanding Face Amount of Collateral |
153,780
|
[1],[4] |
Amortized Cost Basis of Collateral |
141,221
|
[1],[4] |
Carrying Value of Collateral |
140,589
|
[1],[4] |
Weighted Average Maturity (Years) Of Collateral |
1 year 7 months
|
[1] |
Floating Rate Face Amount of Collateral |
42,747
|
[1],[4] |
Aggregate Notional Amount of Current Hedges |
60,804
|
[1],[5] |
CDO VI Bonds Payable
|
|
|
Month Issued |
Apr 2005
|
[1] |
Debt Face Amount |
91,688
|
[1] |
Carrying Value |
91,689
|
[1] |
Final Stated Maturity |
Apr 2040
|
[1] |
Unhedged Weighted Average Funding Cost |
0.86%
|
[1],[2] |
Weighted Average Funding Cost |
5.35%
|
[1],[3] |
Weighted Average Maturity (Years) |
4 years 6 months
|
[1] |
Face Amount of Floating Rate Debt |
88,554
|
[1] |
Outstanding Face Amount of Collateral |
177,513
|
[1],[4] |
Amortized Cost Basis of Collateral |
91,701
|
[1],[4] |
Carrying Value of Collateral |
119,428
|
[1],[4] |
Weighted Average Maturity (Years) Of Collateral |
2 years 10 months
|
[1] |
Floating Rate Face Amount of Collateral |
48,073
|
[1],[4] |
Aggregate Notional Amount of Current Hedges |
88,554
|
[1],[5] |
CDO VIII Bonds Payable
|
|
|
Month Issued |
Nov 2006
|
|
Debt Face Amount |
478,289
|
|
Carrying Value |
477,447
|
|
Final Stated Maturity |
Nov 2052
|
|
Unhedged Weighted Average Funding Cost |
0.80%
|
[2] |
Weighted Average Funding Cost |
2.36%
|
[3] |
Weighted Average Maturity (Years) |
1 year 8 months
|
|
Face Amount of Floating Rate Debt |
470,689
|
|
Outstanding Face Amount of Collateral |
672,349
|
[4] |
Amortized Cost Basis of Collateral |
489,664
|
[4] |
Carrying Value of Collateral |
522,209
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
2 years 4 months
|
|
Floating Rate Face Amount of Collateral |
349,172
|
[4] |
Aggregate Notional Amount of Current Hedges |
154,100
|
[5] |
CDO IX Bonds Payable
|
|
|
Month Issued |
May 2007
|
|
Debt Face Amount |
373,412
|
|
Carrying Value |
374,887
|
|
Final Stated Maturity |
Nov 2052
|
|
Unhedged Weighted Average Funding Cost |
0.60%
|
[2] |
Weighted Average Funding Cost |
0.60%
|
[3] |
Weighted Average Maturity (Years) |
1 year 5 months
|
|
Face Amount of Floating Rate Debt |
373,412
|
|
Outstanding Face Amount of Collateral |
613,694
|
[4] |
Amortized Cost Basis of Collateral |
491,396
|
[4] |
Carrying Value of Collateral |
503,618
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
2 years 7 months
|
|
Floating Rate Face Amount of Collateral |
299,787
|
[4] |
Aggregate Notional Amount of Current Hedges |
|
[5] |
Total CDO Bonds Payable
|
|
|
Debt Face Amount |
1,014,993
|
|
Carrying Value |
1,015,560
|
|
Weighted Average Funding Cost |
2.17%
|
[3] |
Weighted Average Maturity (Years) |
1 year 10 months
|
|
Face Amount of Floating Rate Debt |
993,459
|
|
Outstanding Face Amount of Collateral |
1,617,336
|
[4] |
Amortized Cost Basis of Collateral |
1,213,982
|
[4] |
Carrying Value of Collateral |
1,285,844
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
2 years 5 months
|
|
Floating Rate Face Amount of Collateral |
739,779
|
[4] |
Aggregate Notional Amount of Current Hedges |
303,458
|
[5] |
MH Loans Portfolio I Bonds and Notes Payable
|
|
|
Month Issued |
Apr 2010
|
[6] |
Debt Face Amount |
65,995
|
[6] |
Carrying Value |
62,276
|
[6] |
Final Stated Maturity |
Jul 2035
|
[6] |
Unhedged Weighted Average Funding Cost |
6.31%
|
[2],[6] |
Weighted Average Funding Cost |
6.31%
|
[3],[6] |
Weighted Average Maturity (Years) |
4 years 1 month
|
[6] |
Face Amount of Floating Rate Debt |
|
[6] |
Outstanding Face Amount of Collateral |
114,355
|
[6] |
Amortized Cost Basis of Collateral |
96,752
|
[6] |
Carrying Value of Collateral |
96,752
|
[6] |
Weighted Average Maturity (Years) Of Collateral |
6 years 4 months
|
[6] |
Floating Rate Face Amount of Collateral |
851
|
[6] |
Aggregate Notional Amount of Current Hedges |
|
[5],[6] |
MH Loans Portfolio II Bonds and Notes Payable
|
|
|
Month Issued |
May 2011
|
|
Debt Face Amount |
112,046
|
|
Carrying Value |
111,447
|
|
Final Stated Maturity |
Dec 2033
|
|
Unhedged Weighted Average Funding Cost |
4.47%
|
[2] |
Weighted Average Funding Cost |
4.47%
|
[3] |
Weighted Average Maturity (Years) |
3 years 11 months
|
|
Face Amount of Floating Rate Debt |
|
|
Outstanding Face Amount of Collateral |
146,865
|
[4] |
Amortized Cost Basis of Collateral |
144,274
|
[4] |
Carrying Value of Collateral |
144,274
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
5 years 6 months
|
|
Floating Rate Face Amount of Collateral |
24,374
|
[4] |
Aggregate Notional Amount of Current Hedges |
|
[5] |
Total Other Bonds And Notes Payable
|
|
|
Debt Face Amount |
178,041
|
|
Carrying Value |
173,723
|
|
Weighted Average Funding Cost |
5.13%
|
[3] |
Weighted Average Maturity (Years) |
4 years
|
|
Face Amount of Floating Rate Debt |
|
|
Outstanding Face Amount of Collateral |
261,220
|
[4] |
Amortized Cost Basis of Collateral |
241,026
|
[4] |
Carrying Value of Collateral |
241,026
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
5 years 11 months
|
|
Floating Rate Face Amount of Collateral |
25,225
|
[4] |
Aggregate Notional Amount of Current Hedges |
|
[5] |
Non-agency RMBS Repurchase Agreements
|
|
|
Month Issued |
Various
|
[7],[8] |
Debt Face Amount |
158,029
|
[7],[8] |
Carrying Value |
158,029
|
[7],[8] |
Final Stated Maturity |
Apr 2013
|
[7],[8] |
Unhedged Weighted Average Funding Cost |
LIBOR + 2.00%
|
[2],[7],[8] |
Weighted Average Funding Cost |
2.20%
|
[3],[7],[8] |
Weighted Average Maturity (Years) |
0 years 1 month
|
[7],[8] |
Face Amount of Floating Rate Debt |
158,029
|
[7],[8] |
Outstanding Face Amount of Collateral |
330,871
|
[4],[7],[8] |
Amortized Cost Basis of Collateral |
208,446
|
[4],[7],[8] |
Carrying Value of Collateral |
233,813
|
[4],[7],[8] |
Weighted Average Maturity (Years) Of Collateral |
6 years 10 months
|
[7],[8] |
Floating Rate Face Amount of Collateral |
330,871
|
[4],[7],[8] |
Aggregate Notional Amount of Current Hedges |
|
[5],[7],[8] |
FNMA/FHLMC Securities
|
|
|
Month Issued |
Various
|
[7],[9] |
Debt Face Amount |
1,315,557
|
[7],[9] |
Carrying Value |
1,315,557
|
[7],[9] |
Final Stated Maturity |
Apr 2013
|
[7],[9] |
Unhedged Weighted Average Funding Cost |
0.44%
|
[2],[7],[9] |
Weighted Average Funding Cost |
0.44%
|
[3],[7],[9] |
Weighted Average Maturity (Years) |
0 years 1 month
|
[7],[9] |
Face Amount of Floating Rate Debt |
1,315,557
|
[7],[9] |
Outstanding Face Amount of Collateral |
1,309,855
|
[4],[7],[9] |
Amortized Cost Basis of Collateral |
1,396,401
|
[4],[7],[9] |
Carrying Value of Collateral |
1,400,430
|
[4],[7],[9] |
Weighted Average Maturity (Years) Of Collateral |
4 years 1 month
|
[7],[9] |
Floating Rate Face Amount of Collateral |
1,309,855
|
[4],[7],[9] |
Aggregate Notional Amount of Current Hedges |
|
[5],[7],[9] |
Total Repurchase Agreements
|
|
|
Debt Face Amount |
1,473,586
|
[7] |
Carrying Value |
1,473,586
|
[7] |
Weighted Average Funding Cost |
0.63%
|
[3],[7] |
Weighted Average Maturity (Years) |
0 years 1 month
|
[7] |
Face Amount of Floating Rate Debt |
1,473,586
|
[7] |
Outstanding Face Amount of Collateral |
N/A
|
[4],[7] |
Amortized Cost Basis of Collateral |
1,604,847
|
[4],[7] |
Carrying Value of Collateral |
1,634,243
|
[4],[7] |
Weighted Average Maturity (Years) Of Collateral |
4 years 8 months
|
[7] |
Floating Rate Face Amount of Collateral |
1,640,726
|
[4],[7] |
Aggregate Notional Amount of Current Hedges |
|
[5],[7] |
BPM Senior Living Facilities
|
|
|
Month Issued |
Jul 2012
|
|
Debt Face Amount |
88,400
|
|
Carrying Value |
88,400
|
|
Final Stated Maturity |
Aug 2019
|
|
Unhedged Weighted Average Funding Cost |
3.44%
|
[2] |
Weighted Average Funding Cost |
3.44%
|
[3] |
Weighted Average Maturity (Years) |
6 years
|
|
Face Amount of Floating Rate Debt |
23,400
|
|
Outstanding Face Amount of Collateral |
N/A
|
[4] |
Amortized Cost Basis of Collateral |
135,251
|
[4] |
Carrying Value of Collateral |
135,251
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
N/A
|
|
Floating Rate Face Amount of Collateral |
|
[4] |
Aggregate Notional Amount of Current Hedges |
23,400
|
[5] |
Utah Senior Living Facilities
|
|
|
Month Issued |
Nov 2012
|
|
Debt Face Amount |
16,000
|
|
Carrying Value |
16,000
|
|
Final Stated Maturity |
Oct 2017
|
|
Unhedged Weighted Average Funding Cost |
LIBOR+3.75%
|
[10],[2] |
Weighted Average Funding Cost |
4.75%
|
[3] |
Weighted Average Maturity (Years) |
4 years 6 months
|
|
Face Amount of Floating Rate Debt |
16,000
|
|
Outstanding Face Amount of Collateral |
N/A
|
[4] |
Amortized Cost Basis of Collateral |
21,706
|
[4] |
Carrying Value of Collateral |
21,706
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
N/A
|
|
Floating Rate Face Amount of Collateral |
|
[4] |
Aggregate Notional Amount of Current Hedges |
|
[5] |
Courtyards Senior Living Facilities
|
|
|
Month Issued |
Dec 2012
|
|
Debt Face Amount |
16,125
|
|
Carrying Value |
16,125
|
|
Final Stated Maturity |
Oct 2017
|
|
Unhedged Weighted Average Funding Cost |
LIBOR+3.75%
|
[10],[2] |
Weighted Average Funding Cost |
4.75%
|
[3] |
Weighted Average Maturity (Years) |
4 years 6 months
|
|
Face Amount of Floating Rate Debt |
16,125
|
|
Outstanding Face Amount of Collateral |
N/A
|
[4] |
Amortized Cost Basis of Collateral |
21,036
|
[4] |
Carrying Value of Collateral |
21,036
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
N/A
|
|
Floating Rate Face Amount of Collateral |
|
[4] |
Aggregate Notional Amount of Current Hedges |
|
[5] |
Total Mortgage Notes Payable
|
|
|
Debt Face Amount |
120,525
|
|
Carrying Value |
120,525
|
|
Weighted Average Funding Cost |
3.79%
|
[3] |
Weighted Average Maturity (Years) |
5 years 7 months
|
|
Face Amount of Floating Rate Debt |
55,525
|
|
Outstanding Face Amount of Collateral |
N/A
|
[4] |
Amortized Cost Basis of Collateral |
177,993
|
[4] |
Carrying Value of Collateral |
177,993
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
N/A
|
|
Floating Rate Face Amount of Collateral |
|
[4] |
Aggregate Notional Amount of Current Hedges |
23,400
|
[5] |
Junior Subordinated Debt
|
|
|
Month Issued |
Mar 2006
|
|
Debt Face Amount |
51,004
|
|
Carrying Value |
51,242
|
|
Final Stated Maturity |
Apr 2035
|
|
Unhedged Weighted Average Funding Cost |
7.574%; LIBOR + 2.25% after April 2016
|
[11],[2] |
Weighted Average Funding Cost |
7.40%
|
[3] |
Weighted Average Maturity (Years) |
22 years 1 month
|
|
Face Amount of Floating Rate Debt |
|
|
Outstanding Face Amount of Collateral |
|
[4] |
Amortized Cost Basis of Collateral |
|
[4] |
Carrying Value of Collateral |
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
0 years
|
|
Floating Rate Face Amount of Collateral |
|
[4] |
Aggregate Notional Amount of Current Hedges |
|
[5] |
Total Corporate
|
|
|
Debt Face Amount |
51,004
|
|
Carrying Value |
51,242
|
|
Weighted Average Funding Cost |
7.40%
|
[3] |
Weighted Average Maturity (Years) |
22 years 1 month
|
|
Face Amount of Floating Rate Debt |
|
|
Outstanding Face Amount of Collateral |
|
[4] |
Amortized Cost Basis of Collateral |
|
[4] |
Carrying Value of Collateral |
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
0 years
|
|
Floating Rate Face Amount of Collateral |
|
[4] |
Aggregate Notional Amount of Current Hedges |
|
[5] |
Debt Securities Payable
|
|
|
Debt Face Amount |
2,838,149
|
|
Carrying Value |
2,834,636
|
|
Weighted Average Funding Cost |
1.71%
|
[3] |
Weighted Average Maturity (Years) |
1 year 7 months
|
|
Face Amount of Floating Rate Debt |
2,522,570
|
|
Outstanding Face Amount of Collateral |
3,519,282
|
[4] |
Amortized Cost Basis of Collateral |
3,237,848
|
[4] |
Carrying Value of Collateral |
3,339,106
|
[4] |
Weighted Average Maturity (Years) Of Collateral |
3 years 8 months
|
|
Floating Rate Face Amount of Collateral |
2,405,730
|
[4] |
Aggregate Notional Amount of Current Hedges |
326,858
|
[5] |
Subprime mortgage loans subject to call option
|
|
|
Month Issued |
April 2006 and July 2007
|
[12] |
Debt Face Amount |
406,217
|
[11] |
Carrying Value |
$ 406,115
|
[11] |
|
|