| REAL ESTATE RELATED LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTGAGE LOANS - Schedule of Loans (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sep. 30, 2014
 Loans | ||||||||||||
| Mezzanine Loans [Member] | ||||||||||||
| Outstanding face amount | $ 132,053 | |||||||||||
| Carrying value | 99,666 | |||||||||||
| Loan Count | 7 | |||||||||||
| Weighted Average Yield | 7.25% | |||||||||||
| Weighted Average Coupon | 7.20% | |||||||||||
| Weighted Average Life (Years) | 1 year 2 months 12 days | [1] | ||||||||||
| Floating Rate Loans as a % of Face Amount | 71.60% | |||||||||||
| Delinquent face amount | 12,000 | [2] | ||||||||||
| Corporate Bank Loans [Member] | ||||||||||||
| Outstanding face amount | 169,659 | |||||||||||
| Carrying value | 106,296 | |||||||||||
| Loan Count | 5 | |||||||||||
| Weighted Average Yield | 21.84% | |||||||||||
| Weighted Average Coupon | 13.19% | |||||||||||
| Weighted Average Life (Years) | 1 year 9 months 18 days | [1] | ||||||||||
| Floating Rate Loans as a % of Face Amount | 0.06% | |||||||||||
| B-Notes [Member] | ||||||||||||
| Outstanding face amount | 22,067 | |||||||||||
| Carrying value | 18,761 | |||||||||||
| Loan Count | 1 | |||||||||||
| Weighted Average Yield | 12.00% | |||||||||||
| Weighted Average Coupon | 7.32% | |||||||||||
| Weighted Average Life (Years) | 4 years 3 months 18 days | [1] | ||||||||||
| Floating Rate Loans as a % of Face Amount | 0.00% | |||||||||||
| Whole Loans [Member] | ||||||||||||
| Outstanding face amount | 269 | |||||||||||
| Carrying value | 269 | |||||||||||
| Loan Count | 1 | |||||||||||
| Weighted Average Yield | 4.00% | |||||||||||
| Weighted Average Coupon | 7.48% | |||||||||||
| Weighted Average Life (Years) | 0 years 4 months 24 days | [1] | ||||||||||
| Floating Rate Loans as a % of Face Amount | 0.00% | |||||||||||
| Total Real Estate Related and Other Loans Held-for-Sale, Net [Member] | ||||||||||||
| Outstanding face amount | 324,048 | |||||||||||
| Carrying value | 224,992 | |||||||||||
| Loan Count | 14 | |||||||||||
| Weighted Average Yield | 14.53% | |||||||||||
| Weighted Average Coupon | 10.34% | |||||||||||
| Weighted Average Life (Years) | 1 year 8 months 12 days | [1] | ||||||||||
| Floating Rate Loans as a % of Face Amount | 29.50% | |||||||||||
| Delinquent face amount | 12,000 | [2],[3] | ||||||||||
| Residential Loans [Member] | ||||||||||||
| Outstanding face amount | 4,686 | [4] | ||||||||||
| Carrying value | 4,036 | [5] | ||||||||||
| Loan Count | 8 | |||||||||||
| Weighted Average Yield | 7.74% | |||||||||||
| Weighted Average Coupon | 1.84% | |||||||||||
| Weighted Average Life (Years) | 1 year 8 months 12 days | [1] | ||||||||||
| Floating Rate Loans as a % of Face Amount | 100.00% | |||||||||||
| Delinquent face amount | 1,105 | [2] | ||||||||||
| Total Residential Mortgage Loans Held-for-Sale, Net [Member] | ||||||||||||
| Outstanding face amount | 4,686 | |||||||||||
| Carrying value | 4,036 | |||||||||||
| Loan Count | 8 | |||||||||||
| Weighted Average Yield | 7.74% | |||||||||||
| Weighted Average Coupon | 1.84% | |||||||||||
| Weighted Average Life (Years) | 1 year 8 months 12 days | [1] | ||||||||||
| Floating Rate Loans as a % of Face Amount | 100.00% | |||||||||||
| Delinquent face amount | 1,105 | [2] | ||||||||||
| Subprime Mortgage Loans Subject to Call [Member] | ||||||||||||
| Outstanding face amount | 406,217 | |||||||||||
| Carrying value | $ 406,217 | |||||||||||
| 
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