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Basis of Presentation (Earnings per share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 203,711	$ 166,757
Less: earnings distributed to participating securities	(273)	(308)
Less: undistributed earnings allocated to participating securities	(1,537)	(1,410)
Numerator for basic earnings per share	201,901	165,039
Add back: undistributed earnings allocated to participating securities	1,537	1,410
Less: undistributed earnings reallocated to participating securities	(1,530)	(1,407)
Numerator for diluted earnings per share	$ 201,908	$ 165,042
Denominator:
Basic shares outstanding (shares)	270,000	277,637
Effect of dilutive securities (shares)	1,218	1,003
Diluted shares outstanding (shares)	271,218	278,640
Earnings per share:
Basic earnings (usd per share)	$ 0.75	$ 0.59
Diluted earnings (usd per share)	$ 0.74	$ 0.59

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