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Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Net income	$ 113,981	$ 139,838
Shares used to compute basic earnings per common share (in shares)	153,310	157,434
Dilutive effect of stock options (in shares)	3,231	5,990
Shares used to compute diluted earnings per common share (in shares)	156,541	163,424
Basic earnings per common share (in USD per share)	$ 0.74	$ 0.89
Diluted earnings per common share (in USD per share)	$ 0.73	$ 0.86

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