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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, 2018
Dec. 31, 2017
Carrying Value [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash $ 98,310 $ 77,671
Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements (1,226,786) (1,345,195)
Estimate of Fair Value Measurement [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash 98,310 77,671
Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements (1,226,786) (1,345,195)
Commercial Mortgage Portfolio Segment [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,029,240 2,653,826
Commercial Mortgage Portfolio Segment [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,033,356 2,657,262
Subordinate Mortgage Portfolio Segment [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,038,254 1,025,932
Subordinate Mortgage Portfolio Segment [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,035,838 1,029,390
2019 Notes [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (252,270) (251,935)
2019 Notes [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (273,571) (267,506)
2022 Notes [Member] | Carrying Value [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (333,342) (332,962)
2022 Notes [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes $ (346,604) $ (350,175)