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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, 2018
Dec. 31, 2017
Carrying Value [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents $ 109,806 $ 77,671
Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements (1,897,077) (1,345,195)
Estimated Fair Value [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 109,806 77,671
Estimated Fair Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements (1,897,077) (1,345,195)
Commercial Mortgage Portfolio Segment [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,878,981 2,653,826
Commercial Mortgage Portfolio Segment [Member] | Estimated Fair Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,894,947 2,657,262
Subordinate Mortgage Portfolio Segment [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,048,612 1,025,932
Subordinate Mortgage Portfolio Segment [Member] | Estimated Fair Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,047,854 1,029,390
2019 Notes [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (34,278) (251,935)
2019 Notes [Member] | Estimated Fair Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (35,276) (276,506)
2022 Notes [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (335,291) (332,962)
2022 Notes [Member] | Estimated Fair Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (326,025) (350,175)
2023 Notes [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (222,431) 0
2023 Notes [Member] | Estimated Fair Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes $ (221,964) $ 0