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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Company's Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents $ 116,472 $ 109,806
Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 116,472 109,806
Level 3 | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements (1,783,057) (1,897,077)
Senior secured term loan (490,226) 0
Level 3 | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements (1,783,057) (1,897,077)
Senior secured term loan (496,875) 0
Level 3 | 2019 Notes | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes 0 (34,278)
Level 3 | 2019 Notes | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes 0 (35,276)
Level 3 | 2022 Notes | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (336,505) (335,291)
Level 3 | 2022 Notes | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (344,786) (326,025)
Level 3 | 2023 Notes | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (223,114) (222,431)
Level 3 | 2023 Notes | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (230,097) (221,964)
Level 3 | Commercial Mortgage Portfolio Segment | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,206,754 3,878,981
Level 3 | Commercial Mortgage Portfolio Segment | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,263,296 3,894,947
Level 3 | Subordinate Mortgage Portfolio Segment | Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,236,990 1,048,612
Level 3 | Subordinate Mortgage Portfolio Segment | Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 1,246,454 $ 1,047,854