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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Net income	$ 126,540	$ 121,677	$ 240,521	$ 261,515
Shares used to compute basic earnings per common share (in shares)	151,863	157,542	152,587	157,488
Dilutive effect of stock options (in shares)	3,302	4,683	3,266	5,337
Shares used to compute diluted earnings per common share (in shares)	155,165	162,225	155,853	162,825
Basic earnings per common share (in USD per share)	$ 0.83	$ 0.77	$ 1.58	$ 1.66
Diluted earnings per common share (in USD per share)	$ 0.82	$ 0.75	$ 1.54	$ 1.61

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