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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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net income	$ 117,760	$ 103,324	$ 201,060	$ 158,295
Less: earnings distributed to participating securities	(283)	(185)	(568)	(373)
Less: undistributed earnings allocated to participating securities	(791)	(475)	(1,064)	(647)
Numerator for basic earnings per share	116,686	102,664	199,428	157,275
Add back: undistributed earnings allocated to participating securities	791	475	1,064	647
Less: undistributed earnings reallocated to participating securities	(785)	(471)	(1,055)	(641)
Numerator for diluted earnings per share	$ 116,692	$ 102,668	$ 199,437	$ 157,281
Denominator:
Basic shares outstanding (shares)	345,240	361,009	346,528	363,863
Effect of dilutive securities (shares)	2,759	3,232	2,710	3,297
Diluted shares outstanding (shares)	347,999	364,241	349,238	367,160
Earnings Per Share [Abstract]
Earnings Per Share, Basic (usd per share)	$ 0.34	$ 0.28	$ 0.58	$ 0.43
Earnings Per Share, Diluted (usd per share)	$ 0.34	$ 0.28	$ 0.57	$ 0.43

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