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Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Income from continuing operations	$ 152,763	$ 140,809
Denominator for basic earnings per share—Weighted-average shares outstanding	309,517	308,028
Effect of dilutive securities:
RSUs	619	564
Stock options	1,211	1,708
Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding	311,347	310,300
Basic earnings per share from continuing operations	$ 0.49	$ 0.46
Diluted earnings per share from continuing operations	$ 0.49	$ 0.45

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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