v3.19.3
Long-Term Debt - Additional Information (Details) - Senior Notes
Sep. 30, 2019
9.25% Senior Secured Notes, due 2023  
Debt Instrument [Line Items]  
Debt instrument, percentage rate 9.25%
6.50% Notes, due 2021  
Debt Instrument [Line Items]  
Debt instrument, percentage rate 6.50%