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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Net income	$ 121,677	$ 91,769	$ 261,515	$ 180,506
Shares used to compute basic earnings per common share	157,542	158,325	157,488	158,708
Dilutive effect of stock options (in shares)	4,683	3,384	5,337	3,518
Shares used to compute diluted earnings per common share	162,225	161,709	162,825	162,226
Basic earnings per common share (in USD per share)	$ 0.77	$ 0.58	$ 1.66	$ 1.14
Diluted earnings per common share (in USD per share)	$ 0.75	$ 0.57	$ 1.61	$ 1.11

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