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Use of Special Purpose Entities and Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]    
Residential whole loans, at carrying value $ 4,195,332 $ 6,069,370 [1]
Residential whole loans, at fair value 1,216,902 1,381,583
Residential whole loans 5,300,000 7,400,000
Residential whole loans, net 4,108,499 6,066,345
Senior Notes    
Variable Interest Entity [Line Items]    
Proceeds from issuance of debt 1,300,000  
Proceed from senior notes net of offering expenses and underwriting discount 1,300,000  
Asset-backed Securities, Securitized Loans and Receivables    
Variable Interest Entity [Line Items]    
Proceeds from issuance of debt 1,853,408 802,815
Residential whole loans, at carrying value 1,400,000 186,400
Residential whole loans, at fair value 382,300 567,400
Securitized debt 1,500,000 571,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets    
Variable Interest Entity [Line Items]    
Real estate owned at fair value $ 49,500 $ 137,800
[1] For the year ended December 31, 2020, includes approximately $2.7 million (360,534 shares) surrendered for tax purposes related to equity-based compensation awards. For the year ended December 31, 2019, includes approximately $4.1 million (562,815 shares) surrendered for tax purposes related to equity-based compensation awards. For the year ended December 31, 2018, includes approximately $3.4 million (464,429 shares) surrendered for tax purposes related to equity-based compensation awards.