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Borrowings - Schedule of Senior Notes (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Senior notes $ 311,484 $ 311,085
Senior Unsecured Notes    
Debt Instrument [Line Items]    
Senior notes 21,543 21,543
Senior Notes    
Debt Instrument [Line Items]    
Senior notes 313,052 313,052
Unamortized debt issuance costs (1,230) (1,470)
Fair value adjustments (338) (497)
Long-term debt 311,484 311,085
6.375% Senior Notes, Due 2021 | Senior Unsecured Notes    
Debt Instrument [Line Items]    
Senior notes $ 21,543 21,543
Interest rate (as a percent) 6.375%  
8.375% Senior Secured Notes Due In 2022 | Secured Debt    
Debt Instrument [Line Items]    
Senior notes $ 291,509 $ 291,509
Interest rate (as a percent) 8.375%