Annual report pursuant to Section 13 and 15(d)

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

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Gain (Loss) on Settlement of Investments, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Gain (loss) on sale of real estate securities $ (753,713) $ 205,989 $ (29,936)
Gain (loss) on sale of acquired residential mortgage loans (5,662) 153,174 (7,677)
Gain (loss) on settlement of derivatives (74,812) (129,923) 54,867
Gain (loss) on liquidated residential mortgage loans 4,644 (4,872) (3,734)
Gain (loss) on sale of REO (21,925) (11,521) (12,424)
Gain (loss) on extinguishment of debt (66,233) (8,532) (624)
Gain on settlement of investments in excess MSRs and Servicer advance investments 0 0 113,002
Other gains (losses) (12,430) 23,666 (17,410)
Change in fair value of investments $ (930,131) $ 227,981 $ 96,064