Annual report pursuant to Section 13 and 15(d)

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

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Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
Dec. 31, 2017
Sep. 01, 2017
Aug. 04, 2017
Jul. 31, 2017
Jul. 27, 2017
Dec. 31, 2016
Debt            
Capital leases $ 10,597,000         $ 13,559,000
Total debt 6,754,841,000         5,855,512,000
Less: total current maturities 5,105,000         5,485,000
Less: total deferred financing costs for Notes 8,493,000         7,263,000
Total long-term debt 6,741,243,000         5,842,764,000
Senior Secured Revolving Credit Facility            
Debt            
Principal Amount 1,750,000,000          
Carrying value $ 300,000,000         390,000,000
Senior Notes | 4.25% Senior Notes Due 2020            
Debt            
Stated interest rate 4.25%       4.25%  
Principal Amount $ 0       $ 500,000,000  
Carrying value $ 0         497,069,000
Senior Notes | 5.75% Senior Notes Due 2021            
Debt            
Stated interest rate 5.75%   5.75%      
Principal Amount $ 0   $ 600,000,000      
Carrying value $ 0         596,386,000
Senior Notes | 3.875% Senior Notes Due 2022            
Debt            
Stated interest rate 3.875%     3.875%    
Principal Amount $ 1,000,000,000     $ 1,000,000,000    
Carrying value $ 992,011,000         0
Senior Notes | 4.625% Senior Notes Due 2023            
Debt            
Stated interest rate 4.625%          
Principal Amount $ 500,000,000          
Carrying value $ 496,646,000         496,111,000
Senior Notes | 6.00% Senior Note Due 2024            
Debt            
Stated interest rate 6.00%          
Principal Amount $ 1,500,000,000          
Carrying value $ 1,488,002,000         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 $ 991,285,000         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 $ 990,138,000         989,259,000
Senior Notes | 5.00% Senior Notes Due 2027            
Debt            
Stated interest rate 5.00%     5.00%    
Principal Amount $ 1,500,000,000     $ 1,500,000,000    
Carrying value $ 1,486,162,000         $ 0
Senior Secured Notes | 5.25% Senior Notes Due 2022            
Debt            
Stated interest rate 5.25% 5.25%       5.25%
Principal Amount $ 0 $ 400,000,000        
Carrying value $ 0         $ 396,232,000