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Summary of Significant Accounting Policies - EPS and New Accounting Principle (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Earnings per share          
Basic weighted average number of shares outstanding 315,463 306,785 315,275 288,607  
Weighted Average Number of Shares Outstanding, Diluted 315,463 308,657 316,140 288,607  
U.S. Statutory federal income tax rate (as a percent) 35.00% 35.00% 35.00% 35.00%  
Other Assets, Noncurrent $ 38,928   $ 38,928   $ 26,854
Long-term debt $ 4,510,521   4,510,521   $ 4,703,973
Changes in accrued liabilities     43,043 $ 41,386  
Employee tax withholding for settlement of equity compensation awards     $ (8,500) $ (4,876)  
Restricted stock and restricted stock unit          
Earnings per share          
Add: Dilutive effect of non-vested restricted stock units   1,835 828    
Weighted Average Anti-dilutive Awards 5,054 1,251 2,293 6,899  
Stock options          
Earnings per share          
Weighted Average Anti-dilutive Awards 674 693 679 706  
Performance share unit awards          
Earnings per share          
Add: Dilutive effect of non-vested restricted stock units   37 37    
Weighted Average Anti-dilutive Awards 1,293 660 1,002 577