Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - EPS and New Accounting Principle (Details)

v3.5.0.2
Summary of Significant Accounting Policies - EPS and New Accounting Principle (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Earnings per share          
Weighted Average Number of Shares Outstanding, Basic 281,786 277,003 279,418 271,181  
Weighted Average Number of Shares Outstanding, Diluted 281,786 277,003 279,418 271,192  
New Accounting Pronouncement or Change in Accounting Principle, Retrospective Adjustments [Abstract]          
Other Assets, Noncurrent $ 117,219   $ 117,219   $ 26,565
Long-term debt $ 4,244,014   4,244,014   $ 4,668,782
Changes in accrued liabilities     6,431 $ 15,417  
Employee tax withholding for settlement of equity compensation awards     $ (4,819) (4,513)  
As Previously Reported          
New Accounting Pronouncement or Change in Accounting Principle, Retrospective Adjustments [Abstract]          
Changes in accrued liabilities       10,904  
Adjustment Effect          
New Accounting Pronouncement or Change in Accounting Principle, Retrospective Adjustments [Abstract]          
Changes in accrued liabilities       4,513  
Employee tax withholding for settlement of equity compensation awards       $ (4,513)  
Restricted Stock and Restricted Stock Unit          
Earnings per share          
Dilutive effect of equity awards (in shares)       11  
Weighted Average Anti-dilutive Awards 6,982 2,377 6,862 2,141  
Stock options          
Earnings per share          
Weighted Average Anti-dilutive Awards 706 644 713 364  
Performance share unit awards          
Earnings per share          
Weighted Average Anti-dilutive Awards 724   471