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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securitized debt, at fair value   $ 681,643
Total Liabilities $ 440,791 688,013
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential Bridge Loans 2,584 3,150
Borrowings under repurchase agreements 1,553,715 2,824,801
Convertible senior unsecured notes 197,984 197,299
Securitized debt, at fair value 747,371 801,109
Total Liabilities 2,499,070 3,823,209
Debt issuance costs 5,100 5,300
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential Bridge Loans 2,575 3,148
Borrowings under repurchase agreements 1,358,436 2,829,093
Convertible senior unsecured notes 65,801 209,172
Securitized debt, at fair value 709,366 810,914
Total Liabilities 2,133,603 3,849,179
Residential Bridge Loans | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential Bridge Loans 2,584 3,150
Residential Bridge Loans | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential Bridge Loans $ 2,575 $ 3,148