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, 2018
Dec. 31, 2017
Debt    
Capital leases $ 9,684,000 $ 10,597,000
Total debt 6,820,592,000 6,754,841,000
Less: total current maturities 4,911,000 5,105,000
Less: total deferred financing costs for Notes 8,233,000 8,493,000
Total long-term debt 6,807,448,000 6,741,243,000
Senior Secured Revolving Credit Facility    
Debt    
Principal Amount 1,750,000,000  
Carrying value $ 365,000,000 300,000,000
Senior Notes | 3.875% Senior Notes Due 2022    
Debt    
Stated interest rate 3.875%  
Principal Amount $ 1,000,000,000  
Carrying value $ 992,409,000 992,011,000
Senior Notes | 4.625% Senior Notes Due 2023    
Debt    
Stated interest rate 4.625%  
Principal Amount $ 500,000,000  
Carrying value $ 496,784,000 496,646,000
Senior Notes | 6.00% Senior Note Due 2024    
Debt    
Stated interest rate 6.00%  
Principal Amount $ 1,500,000,000  
Carrying value $ 1,488,377,000 1,488,002,000
Senior Notes | 5.375% Senior Notes Due 2025    
Debt    
Stated interest rate 5.375%  
Principal Amount $ 1,000,000,000  
Carrying value $ 991,529,000 991,285,000
Senior Notes | 5.375% Senior Notes Due 2026    
Debt    
Stated interest rate 5.375%  
Principal Amount $ 1,000,000,000  
Carrying value $ 990,366,000 990,138,000
Senior Notes | 5.00% Senior Notes Due 2027    
Debt    
Stated interest rate 5.00%  
Principal Amount $ 1,500,000,000  
Carrying value $ 1,486,443,000 $ 1,486,162,000