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Debt - Summary of Detail Comprising Debt and Related Book Values (Parenthetical) (Details)
6 Months Ended 12 Months Ended
May 10, 2018
Jun. 30, 2020
Dec. 31, 2019
11.00% Second-Priority Senior Secured Notes – due April 2022      
Debt Instrument [Line Items]      
Debt instrument interest rate   11.00% 11.00%
Senior notes, maturity date   Apr. 03, 2022 Apr. 03, 2022
7.50% Senior Notes – due May 2022      
Debt Instrument [Line Items]      
Debt instrument interest rate   7.50% 7.50%
Senior notes, maturity date   May 31, 2022 May 31, 2022
Bank Credit Facility – matures May 2022      
Debt Instrument [Line Items]      
Senior notes, maturity date May 10, 2022 May 10, 2022  
Senior Notes | 11.00% Second-Priority Senior Secured Notes – due April 2022      
Debt Instrument [Line Items]      
Debt instrument interest rate   11.00%  
Senior notes, maturity date   Apr. 03, 2022  
Senior Notes | 7.50% Senior Notes – due May 2022      
Debt Instrument [Line Items]      
Debt instrument interest rate   7.50%  
Senior notes, maturity date   May 31, 2022  
Bank Credit Facility | Bank Credit Facility – matures May 2022      
Debt Instrument [Line Items]      
Senior notes, maturity date   May 10, 2022