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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
May 31, 2016
Debt Instrument [Line Items]      
Senior Secured Bank Credit Agreement $ 495,000 $ 301,000  
Pipeline financings 195,258 202,671  
Capital lease obligations 34,542 48,718  
Total debt principal balance 2,952,323 2,779,914  
Future interest payable on 9% Senior Secured Second Lien Notes due 2021 [1] 203,686 228,825  
Total debt, net of debt issuance costs 3,142,441 2,993,098  
Less: current maturities of long-term debt [1] (85,002) (83,366)  
Long-term debt and capital lease obligations 3,057,439 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 $ 614,919
Less: current maturities of long-term debt $ (50,490)    
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 $ (13,568) (15,641)  
Senior Subordinated Notes | 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 | 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 | 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 | Other Subordinated Notes      
Debt Instrument [Line Items]      
Senior Subordinated Notes $ 2,251 2,253  
Including premium of $ 1 $ 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 September 30, 2017 include $50.5 million of future interest payable related to the 2021 Senior Secured Notes that is due within the next twelve months.