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Fair Value Measurements - Effect of Fair Value Measured Assets and Liabilities on Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on derivatives   $ 14,493 $ 19,950 $ (4,494)
Unrealized gain (loss) on marketable securities   0 (1,467) 1,896
Derivative expense related to credit default swaps     881 1,100
Fair Value Measurements Recurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on derivatives   14,493 19,950 (4,494)
Unrealized gain (loss) on marketable securities   0 (1,467) 1,896
Realized gain (loss) on marketable securities   0 2,268 84
Net   14,474 1,679 (3,314)
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   (624) 10,106 362
Realized gain (loss) on derivatives   (19) (9,505) (800)
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   (657) (130) (1,666)
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   0 9,974 (3,190)
Realized gain (loss) on derivatives $ 0 0 (9,567)  
Fair Value Measurements Recurring | Embedded debt derivative        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on derivatives   15,774 0 0
Fair Value Measurements Recurring | Derivative liabilities        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities   14,474 1,679 (3,314)
Fair Value Measurements Recurring | Derivative liabilities | Credit default swaps        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities   0 0 (1,092)
Fair Value Measurements Recurring | Derivative liabilities | Embedded debt derivative        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities   15,774 0  
Fair Value Measurements Recurring | Derivative assets        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets   (1,300) 878 (4,202)
Fair Value Measurements Recurring | Derivative assets | Interest rate derivatives - floors        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets   (643) 601 (438)
Fair Value Measurements Recurring | Derivative assets | Interest rate derivatives - caps        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets   (657) (130) (1,666)
Fair Value Measurements Recurring | Derivative assets | Credit default swaps        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets   0 407 (2,098)
Fair Value Measurements Recurring | Non-derivative assets        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets   (1,300) 1,679 (2,222)
Fair Value Measurements Recurring | Non-derivative assets | Equity        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets   $ 0 $ 801 $ 1,980