Quarterly report pursuant to Section 13 or 15(d)

RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME INTO NET INCOME (Details)

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RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME INTO NET INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Portion of other-than-temporary impairment on securities recognized in other comprehensive income $ (110) $ (48)
Gain on settlement of real estate securities 5,917 5,886
Reclassifications 5,883 5,493
Net realized gain (loss) on securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications 5,863 6,182
Net realized gain (loss) derivatives    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications 20 (689)
Portion of other-than-temporary impairment on securities recognized in other comprehensive income | (Impairment) reversal    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Portion of other-than-temporary impairment on securities recognized in other comprehensive income (54) 296
Gain (loss) on settlement of investments, net | Gain on settlement of real estate securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Gain on settlement of real estate securities 5,917 5,886
Interest expense | Amortization of deferred gain    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Loss reclassified from AOCI into income, related to effective portion 20 19
Interest expense | Loss reclassified from AOCI into income, related to effective portion    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amount of loss reclassified from AOCI into income (effective portion) $ 0 $ (708)