Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Long-term Debt Instruments (Details)

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Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Debt    
Capital leases $ 11,473,000 $ 13,559,000
Total debt 5,994,878,000 5,855,512,000
Less: total current maturities 4,637,000 5,485,000
Less: total deferred financing costs for Notes 7,028,000 7,263,000
Total long-term debt 5,983,213,000 5,842,764,000
Senior Secured Revolving Credit Facility    
Debt    
Principal Amount 1,750,000,000  
Carrying value $ 530,000,000 390,000,000
Senior Notes | 4.25% Senior Notes Due 2020    
Debt    
Stated interest rate 4.25%  
Principal Amount $ 500,000,000  
Carrying value $ 497,272,000 497,069,000
Senior Notes | 5.75% Senior Notes Due 2021    
Debt    
Stated interest rate 5.75%  
Principal Amount $ 600,000,000  
Carrying value $ 596,559,000 596,386,000
Senior Notes | 4.625% Senior Notes Due 2023    
Debt    
Stated interest rate 4.625%  
Principal Amount $ 500,000,000  
Carrying value $ 496,243,000 496,111,000
Senior Notes | 6.00% Senior Note Due July 15, 2024    
Debt    
Stated interest rate 6.00%  
Principal Amount $ 1,500,000,000  
Carrying value $ 1,486,909,000 1,486,556,000
Senior Notes | 5.375% Senior Notes Due 2025    
Debt    
Stated interest rate 5.375%  
Principal Amount $ 1,000,000,000  
Carrying value $ 990,572,000 990,340,000
Senior Notes | 5.375% Senior Notes Due 2026    
Debt    
Stated interest rate 5.375%  
Principal Amount $ 1,000,000,000  
Carrying value $ 989,474,000 989,259,000
Senior Secured Notes | 5.25% Senior Notes Due 2022    
Debt    
Stated interest rate 5.25%  
Principal Amount $ 400,000,000  
Carrying value $ 396,376,000 $ 396,232,000