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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Company's Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents $ 582,138 $ 452,282
Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 582,138 452,282
Level 3 | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements, net (3,539,925) (3,078,366)
Senior secured term loan, net (487,117) (487,961)
Level 3 | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements, net (3,539,925) (3,078,366)
Senior secured term loan, net (389,556) (499,988)
Level 3 | 2022 Notes | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (338,393) (337,755)
Level 3 | 2022 Notes | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (239,775) (348,060)
Level 3 | 2023 Notes | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (224,178) (223,818)
Level 3 | 2023 Notes | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (151,800) (234,600)
Level 3 | Commercial Mortgage Portfolio Segment | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 5,413,627 5,326,967
Level 3 | Commercial Mortgage Portfolio Segment | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 5,382,796 5,380,693
Level 3 | Subordinate Mortgage Portfolio Segment | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,016,991 1,048,126
Level 3 | Subordinate Mortgage Portfolio Segment | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 1,013,646 $ 1,050,961