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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Senior Secured Bank Credit Agreement $ 0 $ 475,000
Pipeline financings 183,428 192,429
Capital lease obligations 11,290 26,298
Total debt principal balance 2,541,490 2,775,391
Future interest payable [1] 292,590 316,818
Debt issuance costs (13,772) (7,935)
Total debt, net of debt issuance costs 2,820,308 3,084,274
Less: current maturities of long-term debt [1] (126,884) (105,188)
Long-term Debt and Capital Lease Obligations 2,693,424 2,979,086
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 $ 455,668 381,568
Debt Instrument, Interest Rate, Stated Percentage 9.25%  
7 1/2% Senior Secured Second Lien Notes due 2024 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 450,000 0
Debt Instrument, Interest Rate, Stated Percentage 7.50%  
3 1/2% Convertible Senior Notes Due 2024    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 0 84,650
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
6 3/8% Senior Subordinated Notes due 2021    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 203,545 215,144
Debt Instrument, Interest Rate, Stated Percentage 6.375%  
5 1/2% Senior Subordinated Notes due 2022    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 314,662 408,882
Debt Instrument, Interest Rate, Stated Percentage 5.50%  
4 5/8% Senior Subordinated Notes due 2023    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 307,978 376,501
Debt Instrument, Interest Rate, Stated Percentage 4.625%  
Future interest payable on senior secured and convertible senior notes    
Debt Instrument [Line Items]    
Less: current maturities of long-term debt $ (102,181) (75,347)
Long-term Debt and Capital Lease Obligations $ 190,410 $ 241,472
[1] 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”), 9¼% Senior Secured Second Lien Notes due 2022 (the “2022 Senior Secured Notes”), and to a small extent our previously outstanding 3½% Convertible Senior Notes due 2024 (the “2024 Convertible Senior Notes”) and has been accounted for as debt in accordance with FASC 470-60, Troubled Debt Restructuring by Debtors. Our current maturities of long-term debt as of September 30, 2018 include $102.2 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. See January 2018 Note Exchanges below for further discussion.