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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Net income	$ 132,168	$ 128,319	$ 372,689	$ 389,834
Shares used to compute basic earnings per common share (in shares)	150,855	156,283	152,009	157,086
Dilutive effect of stock options (in shares)	3,372	4,228	3,302	4,967
Shares used to compute diluted earnings per common share (in shares)	154,227	160,511	155,311	162,053
Basic earnings per common share (in USD per share)	$ 0.88	$ 0.82	$ 2.45	$ 2.48
Diluted earnings per common share (in USD per share)	$ 0.86	$ 0.80	$ 2.40	$ 2.41

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