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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Company's Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents $ 438,234 $ 452,282
Carrying Value | Level III    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements, net (3,465,337) (3,078,366)
Senior secured term loan, net (484,191) (487,961)
Carrying Value | Level III | 2022 Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (339,695) (337,755)
Carrying Value | Level III | 2023 Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (224,916) (223,818)
Carrying Value | Level III | Commercial Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 5,427,945 5,326,967
Carrying Value | Level III | Subordinate Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,009,092 1,048,126
Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 438,234 452,282
Estimate of Fair Value Measurement | Level III    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements, net (3,465,337) (3,078,366)
Senior secured term loan, net (471,531) (499,988)
Estimate of Fair Value Measurement | Level III | 2022 Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (326,867) (348,060)
Estimate of Fair Value Measurement | Level III | 2023 Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (206,126) (234,600)
Estimate of Fair Value Measurement | Level III | Commercial Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 5,337,301 5,380,693
Estimate of Fair Value Measurement | Level III | Subordinate Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 982,961 $ 1,050,961