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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
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securitized debt $ 1,344,370 $ 1,553,722
Total 1,344,972 1,554,378
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage loans on real estate, carrying amount of mortgages 0 1,103
Borrowings under repurchase agreements 617,189 356,923
Convertible senior unsecured notes 119,168 170,797
Securitized debt 524,649 899,207
Total 1,261,006 1,426,927
Debt issuance costs, net 5,500 6,900
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage loans on real estate, carrying amount of mortgages 0 1,095
Borrowings under repurchase agreements 617,794 359,799
Convertible senior unsecured notes 122,133 155,129
Securitized debt 528,046 922,362
Total $ 1,267,973 1,437,290
Residential Bridge Loans | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage loans on real estate, carrying amount of mortgages   1,103
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   $ 1,095