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Basis of Presentation Basis of Presentation (Earnings per share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 128,470	$ 107,769	$ 329,530	$ 266,062
Less: earnings distributed to participating securities	(269)	(181)	(836)	(554)
Less: undistributed earnings allocated to participating securities	(870)	(516)	(1,764)	(1,169)
Numerator for basic earnings per share	127,331	107,072	326,930	264,339
Add back: undistributed earnings allocated to participating securities	870	516	1,764	1,169
Less: undistributed earnings reallocated to participating securities	(865)	(512)	(1,751)	(1,158)
Numerator for diluted earnings per share	$ 127,336	$ 107,076	$ 326,943	$ 264,350
Denominator:
Basic shares outstanding (shares)	340,171	350,147	344,383	359,236
Effect of dilutive securities (shares)	2,250	3,225	2,557	3,273
Diluted shares outstanding (shares)	342,421	353,372	346,940	362,509
Earnings per share:
Basic earnings (usd per share)	$ 0.37	$ 0.31	$ 0.95	$ 0.74
Diluted earnings (usd per share)	$ 0.37	$ 0.30	$ 0.94	$ 0.73

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