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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accounting Policies [Abstract]
Net income	$ 128,319	$ 101,739	$ 389,834	$ 282,245
Shares used to compute basic earnings per common share (in shares)	156,283	157,902	157,086	158,439
Dilutive effect of stock options (in shares)	4,228	3,246	4,967	3,427
Shares used to compute diluted earnings per common share (in shares)	160,511	161,148	162,053	161,866
Basic earnings per common share (in USD per share)	$ 0.82	$ 0.64	$ 2.48	$ 1.78
Diluted earnings per common share (in USD per share)	$ 0.80	$ 0.63	$ 2.41	$ 1.74

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