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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, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Net income	$ 129,470	$ 109,242
Shares used to compute basic earnings per common share (in shares)	143,201	149,468
Dilutive effect of stock options (in shares)	2,105	2,900
Shares used to compute diluted earnings per common share (in shares)	145,306	152,368
Basic earnings per common share (in USD per share)	$ 0.90	$ 0.73
Diluted earnings per common share (in USD per share)	$ 0.89	$ 0.72

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