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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Senior Secured Bank Credit Agreement $ 265,000 $ 0
Pipeline financings 160,428 167,439
Capital lease obligations 157 0
Total debt principal balance 2,489,777 2,281,726
Debt discount [1] (88,442) (101,767)
Future interest payable [2] 119,454 164,914
Debt issuance costs (8,537) (10,009)
Total debt, net of debt issuance costs and discount 2,512,252 2,334,864
Less: current maturities of long-term debt [3] (2,366,330) (102,294)
Long-term debt 145,922 2,232,570
9% Senior Secured Second Lien Notes due 2021    
Debt Instrument [Line Items]    
Outstanding debt principal balance $ 584,709 614,919
Stated interest rate percentage 9.00%  
9 1/4% Senior Secured Second Lien Notes due 2022    
Debt Instrument [Line Items]    
Outstanding debt principal balance $ 455,668 455,668
Stated interest rate percentage 9.25%  
7 3/4% Senior Secured Second Lien Notes due 2024    
Debt Instrument [Line Items]    
Outstanding debt principal balance $ 531,821 531,821
Debt discount $ (24,400)  
Stated interest rate percentage 7.75%  
7 1/2% Senior Secured Second Lien Notes due 2024    
Debt Instrument [Line Items]    
Outstanding debt principal balance $ 20,641 20,641
Stated interest rate percentage 7.50%  
6 3/8% Convertible Senior Notes due 2024    
Debt Instrument [Line Items]    
Outstanding debt principal balance $ 225,663 245,548
Debt discount $ (64,000)  
Stated interest rate percentage 6.375%  
6 3/8% Senior Subordinated Notes due 2021    
Debt Instrument [Line Items]    
Outstanding debt principal balance $ 51,304 51,304
Stated interest rate percentage 6.375%  
5 1/2% Senior Subordinated Notes due 2022    
Debt Instrument [Line Items]    
Outstanding debt principal balance $ 58,426 58,426
Stated interest rate percentage 5.50%  
4 5/8% Senior Subordinated Notes due 2023    
Debt Instrument [Line Items]    
Outstanding debt principal balance $ 135,960 135,960
Stated interest rate percentage 4.625%  
Future interest payable on senior secured notes    
Debt Instrument [Line Items]    
Less: current maturities of long-term debt $ (119,454) (86,054)
Long-term debt $ 0 $ 78,860
[1] Consists of discounts related to our 7¾% Senior Secured Second Lien Notes due 2024 and 6⅜% Convertible Senior Notes due 2024 of $24.4 million and $64.0 million, respectively, as of June 30, 2020
[2]
Future interest payable represents most of the interest due over the terms of our 9% Senior Secured Second Lien Notes due 2021 (the “2021 Senior Secured Notes”) and 9¼% Senior Secured Second Lien Notes due 2022 (the “2022 Senior Secured Notes”) and has been accounted for as debt in accordance with FASC 470-60, Troubled Debt Restructuring by Debtors.
[3] Our current maturities of long-term debt as of June 30, 2020 include $119.5 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months.