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Borrowings - Narrative (Details) - USD ($)
12 Months Ended
Dec. 05, 2016
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Covenant liquidity requirement   $ 27,500,000
Debt Instrument Covenant Compliance on Repurchase of Securities and Prepayment of Junior Debt   $ 10,000,000.0
SSTL    
Line of Credit Facility [Line Items]    
Percentage of loan to value   40.00%
Minimum unencumbered asset coverage ratio for period one (percentage)   200.00%
Minimum unencumbered asset coverage ratio for period two (percentage)   225.00%
Minimum unrestricted cash requirement   $ 125,000,000.0
Minimum    
Line of Credit Facility [Line Items]    
Debt covenant, required consolidated tangible net worth   200,000,000.0
Covenant liquidity requirement   $ 125,000,000.0
Debt Instrument, Redemption, Period | Minimum | Senior Notes    
Line of Credit Facility [Line Items]    
Redemption period, notice   30 days
Debt Instrument, Redemption, Period | Maximum | Senior Notes    
Line of Credit Facility [Line Items]    
Redemption period, notice   60 days
Debt Instrument, Redemption, Period    
Line of Credit Facility [Line Items]    
Redemption Price   100.00%
Debt Instrument, Redemption, Period    
Line of Credit Facility [Line Items]    
Redemption Price   102.094%
8.375% Senior Secured Notes Due In 2022    
Line of Credit Facility [Line Items]    
Debt instrument stated percentage of interest (percentage)   8.375%
8.375% Senior Secured Notes Due In 2022 | Senior Notes    
Line of Credit Facility [Line Items]    
Percentage of principal amount, repurchase price 101.00%  
8.375% Senior Secured Notes Due In 2022 | Secured Debt    
Line of Credit Facility [Line Items]    
Debt instrument stated percentage of interest (percentage)   8.375%