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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Senior Secured Bank Credit Agreement $ 0   $ 0
Pipeline financings 167,439,000   180,073,000
Capital lease obligations 0   5,362,000
Total debt principal balance 2,281,726,000   2,532,207,000
Debt discount (101,767,000) [1]   0
Future interest payable [2] 164,914,000   250,218,000
Debt issuance costs (10,009,000)   (13,089,000)
Total debt, net of debt issuance costs and discount 2,334,864,000   2,769,336,000
Less: current maturities of long-term debt (102,294,000) [3]   (105,125,000)
Long-term Debt and Lease Obligation 2,232,570,000   2,664,211,000
9% Senior Secured Second Lien Notes due 2021      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 614,919,000   614,919,000
Stated interest rate percentage 9.00%    
9 1/4% Senior Secured Second Lien Notes due 2022      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 455,668,000   455,668,000
Stated interest rate percentage 9.25%    
7 3/4% Senior Secured Second Lien Notes due 2024      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 531,821,000   0
Debt discount $ (27,000,000.0) $ (22,600,000)  
Stated interest rate percentage 7.75%    
7 1/2% Senior Secured Second Lien Notes due 2024      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 20,641,000   450,000,000
Stated interest rate percentage 7.50%    
6 3/8% Convertible Senior Notes due 2024      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 245,548,000   0
Debt discount $ (74,800,000) $ (79,900,000)  
Stated interest rate percentage 6.375%    
6 3/8% Senior Subordinated Notes due 2021      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 51,304,000   203,545,000
Stated interest rate percentage 6.375%    
5 1/2% Senior Subordinated Notes due 2022      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 58,426,000   314,662,000
Stated interest rate percentage 5.50%    
4 5/8% Senior Subordinated Notes due 2023      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 135,960,000   307,978,000
Stated interest rate percentage 4.625%    
Future interest payable on senior secured notes      
Debt Instrument [Line Items]      
Less: current maturities of long-term debt $ (86,054,000)   (85,303,000)
Long-term Debt and Lease Obligation $ 78,860,000   $ 164,914,000
[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 $27.0 million and $74.8 million, respectively (see 2019 Debt Reduction Transactions below) as of December 31, 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 December 31, 2019 include $86.1 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.