Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Gain (Loss) on Settlement of Investments (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Gain (Loss) on Settlement of Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
(Gain) on settlement of real estate securities $ (2,345) $ (19,129) $ (42,356)
Loss on settlement of real estate securities 2,803 16,178 9,850
Realized loss (gain) on settlement of TBAs, net 4,669 (18,318) 12,907
(Gain) loss on settlement of loans held-for-sale (12) 48 (1,519)
Loss recognized on termination of derivative instruments 0 0 612
Unrealized loss on securities, intent-to-sell 558 23,128 0
Unrealized loss (gain) on non-hedge derivative instruments 570 (1,222) (1,758)
Realized and unrealized loss (gain) on investments 6,243 685 (22,264)
(Loss) gain on lease modifications and terminations (161) (62) 471
Collateral management fee income, net 387 592 708
Equity in earnings (losses) of equity method investments, net 1,536 (1,338) (6,194)
(Loss) on disposal of long-lived assets (295) (22) (1,403)
Other (loss) income (1,079) (2,244) 844
Other income (loss), net $ 388 $ (3,074) $ (5,574)