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Basis of Presentation (Earnings per share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 289,535	$ 177,539	$ 784,375	$ 369,807
Less: earnings distributed to participating securities	(279)	(294)	(874)	(899)
Less: undistributed earnings allocated to participating securities	(2,871)	(1,645)	(7,752)	(2,837)
Numerator for basic earnings per share	286,385	175,600	775,749	366,071
Add back: undistributed earnings allocated to participating securities	2,871	1,645	7,752	2,837
Less: undistributed earnings reallocated to participating securities	(2,859)	(1,636)	(7,724)	(2,820)
Numerator for diluted earnings per share	$ 286,397	$ 175,609	$ 775,777	$ 366,088
Denominator:
Basic shares outstanding (shares)	283,489	298,538	285,127	309,453
Effect of dilutive securities (shares)	1,183	1,690	1,301	1,861
Diluted shares outstanding (shares)	284,672	300,228	286,428	311,314
Earnings per share:
Basic earnings (usd per share)	$ 1.01	$ 0.59	$ 2.72	$ 1.18
Diluted earnings (usd per share)	$ 1.01	$ 0.58	$ 2.71	$ 1.18

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