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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
May 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Senior Secured Bank Credit Agreement $ 301,000   $ 175,000
9% Senior Secured Second Lien Notes due 2021 614,919 $ 614,900 0
Pipeline financings 202,671   211,766
Capital lease obligations 48,718   71,324
Total debt principal balance 2,779,914   3,310,347
Future interest payable on 9% Senior Secured Second Lien Notes Due 2021 228,825 [1] $ 254,700 0
Total debt, net of debt issuance costs 2,993,098   3,277,595
Less: current maturities of long-term debt (83,366) [1]   (32,481)
Long-term Debt and Capital Lease Obligations 2,909,732   3,245,114
9% Senior Secured Second Lien Notes due 2021      
Debt Instrument [Line Items]      
Less: current maturities of long-term debt $ (50,300)    
Debt Instrument, Interest Rate, Stated Percentage 9.00%    
Second Lien and Senior Subordinated Notes      
Debt Instrument [Line Items]      
Issuance costs on senior secured second lien and senior subordinated notes $ (15,641)   (32,752)
Senior Subordinated Notes | 6 3/8% Senior Subordinated Notes due 2021      
Debt Instrument [Line Items]      
Senior Subordinated Notes $ 215,144   400,000
Debt Instrument, Interest Rate, Stated Percentage 6.375%    
Senior Subordinated Notes | 5 1/2% Senior Subordinated Notes due 2022      
Debt Instrument [Line Items]      
Senior Subordinated Notes $ 772,912   1,250,000
Debt Instrument, Interest Rate, Stated Percentage 5.50%    
Senior Subordinated Notes | 4 5/8% Senior Subordinated Notes due 2023      
Debt Instrument [Line Items]      
Senior Subordinated Notes $ 622,297   1,200,000
Debt Instrument, Interest Rate, Stated Percentage 4.625%    
Senior Subordinated Notes | Other Subordinated Notes      
Debt Instrument [Line Items]      
Senior Subordinated Notes $ 2,253   2,257
Including premium of $ 3   $ 7
[1] Future interest payable on our 9% Senior Secured Second Lien Notes due 2021 (the “2021 Senior Secured Notes”) represents most of the interest due over the term of this obligation, which 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 December 31, 2016 include $50.3 million of future interest payable related to the 2021 Senior Secured Notes that is due within the next twelve months. See 2016 Senior Subordinated Notes Exchange below for further discussion.