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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Debt Instrument [Line Items]      
Pipeline financings $ 68,008 $ 167,439  
Total debt principal balance 138,008 2,281,726  
Debt discount 0 (101,767)  
Future interest payable 0 164,914  
Debt issuance costs 0 (10,009)  
Total debt, net of debt issuance costs and discount 138,008 2,334,864  
Less: current maturities of long-term debt (68,008) (102,294)  
Long-term debt and capital lease obligations 70,000 2,232,570  
Successor Senior Secured Bank Credit Agreement      
Debt Instrument [Line Items]      
Outstanding borrowings on bank credit facility 70,000 0  
Predecessor Senior Secured Bank Credit Agreement      
Debt Instrument [Line Items]      
Outstanding borrowings on bank credit facility 0 0  
9% Senior Secured Second Lien Notes due 2021      
Debt Instrument [Line Items]      
Outstanding debt principal balance 0 $ 614,919  
Stated interest rate percentage   9.00%  
9 1/4% Senior Secured Second Lien Notes due 2022      
Debt Instrument [Line Items]      
Outstanding debt principal balance 0 $ 455,668  
Stated interest rate percentage   9.25%  
7 3/4% Senior Secured Second Lien Notes due 2024      
Debt Instrument [Line Items]      
Outstanding debt principal balance 0 $ 531,821  
Debt discount     $ (22,600)
Stated interest rate percentage   7.75%  
7 1/2% Senior Secured Second Lien Notes due 2024      
Debt Instrument [Line Items]      
Outstanding debt principal balance 0 $ 20,641  
Stated interest rate percentage   7.50%  
6 3/8% Convertible Senior Notes due 2024      
Debt Instrument [Line Items]      
Outstanding debt principal balance 0 $ 245,548  
Debt discount     $ (79,900)
Stated interest rate percentage   6.375%  
6 3/8% Senior Subordinated Notes due 2021      
Debt Instrument [Line Items]      
Outstanding debt principal balance 0 $ 51,304  
Stated interest rate percentage   6.375%  
5 1/2% Senior Subordinated Notes due 2022      
Debt Instrument [Line Items]      
Outstanding debt principal balance 0 $ 58,426  
Stated interest rate percentage   5.50%  
4 5/8% Senior Subordinated Notes due 2023      
Debt Instrument [Line Items]      
Outstanding debt principal balance $ 0 $ 135,960  
Stated interest rate percentage   4.625%