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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Jun. 19, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Senior Secured Bank Credit Agreement $ 50,000     $ 0
Pipeline financings 171,067     180,073
Capital lease obligations 0     5,362
Total debt principal balance 2,436,399     2,532,207
Debt discount [1] (105,426)     0
Future interest payable [2] 190,410     250,218
Debt issuance costs (11,074)     (13,089)
Total debt, net of debt issuance costs and discount 2,510,309     2,769,336
Less: current maturities of long-term debt [3] (100,626)     (105,125)
Long-term Debt and Capital Lease Obligation 2,409,683     2,664,211
9% Senior Secured Second Lien Notes due 2021        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 614,919     614,919
Debt Instrument, Interest Rate, Stated Percentage 9.00%      
9 1/4% Senior Secured Second Lien Notes due 2022        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 455,668     455,668
Debt Instrument, Interest Rate, Stated Percentage 9.25%      
7 3/4% Senior Secured Second Lien Notes due 2024        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 531,821 $ 528,000   0
Debt discount $ (28,200)   $ (6,900)  
Debt Instrument, Interest Rate, Stated Percentage 7.75%      
7 1/2% Senior Secured Second Lien Notes due 2024        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 20,641     450,000
Debt Instrument, Interest Rate, Stated Percentage 7.50%      
6 3/8% Convertible Senior Notes due 2024        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 245,548     0
Debt discount $ (77,200)      
Debt Instrument, Interest Rate, Stated Percentage 6.375%      
6 3/8% Senior Subordinated Notes due 2021        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 51,304     203,545
Debt Instrument, Interest Rate, Stated Percentage 6.375%      
5 1/2% Senior Subordinated Notes due 2022        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 83,736     314,662
Debt Instrument, Interest Rate, Stated Percentage 5.50%      
4 5/8% Senior Subordinated Notes due 2023        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 211,695     307,978
Debt Instrument, Interest Rate, Stated Percentage 4.625%      
Future interest payable on senior secured notes        
Debt Instrument [Line Items]        
Less: current maturities of long-term debt $ (85,909)     (85,303)
Long-term Debt and Capital Lease Obligation $ 104,501     $ 164,914
[1] Consists of discounts related to the issuance during June 2019 of our new 7¾% Senior Secured Second Lien Notes due 2024 (the “7¾% Senior Secured Notes”) and new 6⅜% Convertible Senior Notes due 2024 (the “2024 Convertible Senior Notes”) of $28.2 million and $77.2 million, respectively (see 2019 Debt Reduction Transactions below) as of September 30, 2019
[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 September 30, 2019 include $85.9 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.