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Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Income from continuing operations	$ 122,381	$ 109,844	$ 414,104	$ 359,825
Net Income	$ 122,381	$ 122,688	$ 409,573	$ 377,644
Denominator for basic earnings per share—Weighted-average shares outstanding	308,909	307,190	308,451	306,690
Effect of dilutive securities:
RSUs	485	681	501	686
Stock options	1,385	2,165	1,543	2,295
Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding	310,779	310,036	310,495	309,671
Basic earnings per share from continuing operations	$ 0.40	$ 0.36	$ 1.34	$ 1.17
Diluted earnings per share from continuing operations	$ 0.39	$ 0.35	$ 1.33	$ 1.16

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