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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securitized debt $ 1,057  
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securitized debt 681,643 $ 949,626
Total 688,013 959,756
Recurring basis | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage loans on real estate, carrying amount of mortgages 3,150 9,720
Borrowings under repurchase agreements 2,824,801 2,818,837
Convertible senior unsecured notes 197,299 110,060
Securitized debt 801,109 0
Total 3,823,209 2,928,897
Debt issuance costs, net 5,300  
Recurring basis | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage loans on real estate, carrying amount of mortgages 3,148 9,603
Borrowings under repurchase agreements 2,829,093 2,823,615
Convertible senior unsecured notes 209,172 108,531
Securitized debt 810,914 0
Total 3,849,179 2,932,146
Recurring basis | Residential Bridge Loans | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage loans on real estate, carrying amount of mortgages 3,150 9,720
Recurring basis | Residential Bridge Loans | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage loans on real estate, carrying amount of mortgages $ 3,148 $ 9,603