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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, 2019
Dec. 31, 2018
Carrying Value [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents $ 109,343 $ 109,806
Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements (2,159,767) (1,897,077)
Estimate of Fair Value Measurement [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 109,343 109,806
Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements (2,159,767) (1,897,077)
Commercial Mortgage Portfolio Segment [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,003,089 3,878,981
Commercial Mortgage Portfolio Segment [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,025,760 3,894,947
Subordinate Mortgage Portfolio Segment [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,183,910 1,048,612
Subordinate Mortgage Portfolio Segment [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,187,128 1,047,854
2019 Notes [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes 0 (34,278)
2019 Notes [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes 0 (35,276)
2022 Notes [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (335,894) (335,291)
2022 Notes [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (337,762) (326,025)
2023 Notes [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (222,770) (222,431)
2023 Notes [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes $ (225,770) $ (221,964)