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.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Earnings per share
Basic weighted average number of shares outstanding	315,401	281,786	315,179	279,418
Weighted Average Number of Shares Outstanding, Diluted	315,401	281,786	315,927	279,418
U.S. Statutory federal income tax rate (as a percent)	35.00%		35.00%
Other Assets, Noncurrent	$ 36,631		$ 36,631		$ 26,854
Long-term debt	$ 5,291,973		5,291,973		$ 4,703,973
Changes in accrued liabilities			4,204	$ (3,362)
Employee tax withholding for settlement of equity compensation awards			$ (8,433)	$ (4,819)
Restricted stock and restricted stock unit
Earnings per share
Add: Dilutive effect of non-vested restricted stock units			710
Weighted Average Anti-dilutive Awards	5,105	6,982	1,596	6,862
Stock options
Earnings per share
Weighted Average Anti-dilutive Awards	679	706	681	713
Performance share unit awards
Earnings per share
Add: Dilutive effect of non-vested restricted stock units			38
Weighted Average Anti-dilutive Awards	1,213	724	896	471