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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Senior Secured Bank Credit Agreement $ 355,000 $ 301,000
Pipeline financings 200,038 202,671
Capital lease obligations 43,649 48,718
Total debt principal balance 2,826,211 2,779,914
Future interest payable on 9% Senior Secured Second Lien Notes Due 2021 [1] 228,825 228,825
Total debt, net of debt issuance costs 3,040,086 2,993,098
Less: current maturities of long-term debt [1] (83,701) (83,366)
Long-term debt and capital lease obligations 2,956,385 2,909,732
9% Senior Secured Second Lien Notes Due 2021    
Debt Instrument [Line Items]    
9% Senior Secured Second Lien Notes due 2021 614,919 614,919
Less: current maturities of long-term debt $ (50,300)  
Debt Instrument, Interest Rate, Stated Percentage 9.00%  
Second Lien and Senior Subordinated Notes [Member]    
Debt Instrument [Line Items]    
Issuance costs on senior secured second lien and senior subordinated notes $ (14,950) (15,641)
Senior Subordinated Notes [Member] | 6 3/8% Senior Subordinated Notes due 2021    
Debt Instrument [Line Items]    
Senior Subordinated Notes $ 215,144 215,144
Debt Instrument, Interest Rate, Stated Percentage 6.375%  
Senior Subordinated Notes [Member] | 5 1/2% Senior Subordinated Notes due 2022    
Debt Instrument [Line Items]    
Senior Subordinated Notes $ 772,912 772,912
Debt Instrument, Interest Rate, Stated Percentage 5.50%  
Senior Subordinated Notes [Member] | 4 5/8% Senior Subordinated Notes due 2023    
Debt Instrument [Line Items]    
Senior Subordinated Notes $ 622,297 622,297
Debt Instrument, Interest Rate, Stated Percentage 4.625%  
Senior Subordinated Notes [Member] | Other Subordinated Notes    
Debt Instrument [Line Items]    
Senior Subordinated Notes $ 2,252 2,253
Including premium of $ 2 $ 3
[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 Financial Accounting Standards Board Codification (“FASC”) 470-60, Troubled Debt Restructuring by Debtors. Our current maturities of long-term debt as of March 31, 2017 include $50.3 million of future interest payable related to the 2021 Senior Secured Notes that is due within the next twelve months.