Summary of Significant Accounting Policies - EPS and New Accounting Principle (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings per share
Weighted Average Number of Shares Outstanding, Basic	294,945	274,123	262,054
Weighted Average Number of Shares Outstanding, Diluted	294,945	274,143	262,068
Other Assets, Noncurrent	$ 95,153	$ 26,565
Long-term debt	4,703,973	4,668,782
Changes in accrued liabilities	18,853	36,377	$ 95,066
Employee tax withholding for settlement of equity compensation awards	$ (26,895)	(9,431)	$ (142)
As Previously Reported
Earnings per share
Changes in accrued liabilities		26,946
Adjustment Effect
Earnings per share
Changes in accrued liabilities		9,431
Employee tax withholding for settlement of equity compensation awards		$ (9,431)
Restricted stock and restricted stock unit [Member]
Earnings per share
Dilutive effect of equity awards (in shares)		20	14
Weighted Average Anti-dilutive Awards	6,740	2,264	1,444
Stock options
Earnings per share
Weighted Average Anti-dilutive Awards	702	553	73
Performance share unit awards
Earnings per share
Weighted Average Anti-dilutive Awards	659

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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