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Fair Value Measurements (Effect of Fair Value Measured Assets and Liabilities on Consolidated Statements of Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on derivatives $ 6,449 $ (2,536) $ 11,063 $ (4,054)
Unrealized gain (loss) on marketable securities (758) 315 (1,756) 1,721
Derivative expense related to credit default swaps 271 272 811 809
Fair Value Measurements Recurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on derivatives 6,449 (2,536) 11,063 (4,054)
Unrealized gain (loss) on marketable securities (758) 315 (1,756) 1,721
Realized gain (loss) on marketable securities 34 28 2,142 44
Net (555) (2,343) 1,944 (2,827)
Fair Value Measurements Recurring | Interest rate derivatives - floors        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on derivatives 6,185 (1,866) 10,173 441
Realized gain (loss) on interest rate floors (6,280) (150) (9,505) (538)
Fair Value Measurements Recurring | Interest rate derivatives - caps        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on derivatives (59) (300) (129) (1,414)
Fair Value Measurements Recurring | Credit default swaps        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on derivatives 323 (370) 1,019 (3,081)
Fair Value Measurements Recurring | Derivative liabilities        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Gain or (loss) recognized in income, liabilities (555) (2,343) 1,944 (2,827)
Fair Value Measurements Recurring | Derivative liabilities | Credit default swaps        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Gain or (loss) recognized in income, liabilities 0 (157) 0 (1,078)
Fair Value Measurements Recurring | Derivative assets        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Gain or (loss) recognized in income, assets 169 (2,529) 1,558 (3,514)
Fair Value Measurements Recurring | Derivative assets | Interest rate derivatives - floors        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Gain or (loss) recognized in income, assets (95) (2,016) 668 (97)
Fair Value Measurements Recurring | Derivative assets | Interest rate derivatives - caps        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Gain or (loss) recognized in income, assets (59) (300) (129) (1,414)
Fair Value Measurements Recurring | Derivative assets | Credit default swaps        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Gain or (loss) recognized in income, assets 323 (213) 1,019 (2,003)
Fair Value Measurements Recurring | Non-derivative assets        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Gain or (loss) recognized in income, assets (555) (2,186) 1,944 (1,749)
Fair Value Measurements Recurring | Non-derivative assets | Equity        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Gain or (loss) recognized in income, assets $ (724) $ 343 $ 386 $ 1,765