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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Company's Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents $ 452,282 $ 109,806
Carrying Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements, net (3,078,366) (1,897,077)
Senior secured term loan, net (487,961) 0
Estimate of Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 452,282 109,806
Estimate of Fair Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements, net (3,078,366) (1,897,077)
Senior secured term loan, net (499,988) 0
Commercial Mortgage Portfolio Segment | Carrying Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 5,326,967 3,878,981
Commercial Mortgage Portfolio Segment | Estimate of Fair Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 5,380,693 3,894,947
Subordinate Mortgage and Other Lending Assets Portfolio Segment | Carrying Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,048,126 1,048,612
Subordinate Mortgage and Other Lending Assets Portfolio Segment | Estimate of Fair Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,050,961 1,047,854
2019 Notes | Carrying Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes 0 (34,278)
2019 Notes | Estimate of Fair Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes 0 (35,276)
2022 Notes | Carrying Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (337,755) (335,291)
2022 Notes | Estimate of Fair Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (348,060) (326,025)
2023 Notes | Carrying Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (223,818) (222,431)
2023 Notes | Estimate of Fair Value | Level 3    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes $ (234,600) $ (221,964)