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Earnings Per Share (Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Net income	$ 29,578	$ 24,158	$ 73,389	$ 55,924
Weighted-average common shares outstanding	72,811,000	72,549,000	72,770,000	72,279,000
Dilutive effect of stock-based awards	420,000	373,000	433,000	468,000
Shares used in computing diluted earnings per share	73,231,000	72,922,000	73,203,000	72,747,000
Basic earnings per share	$ 0.41	$ 0.33	$ 1.01	$ 0.77
Diluted earnings per share	$ 0.40	$ 0.33	$ 1.00	$ 0.77
Number of antidilutive options that were excluded from computation of earnings per share	0	0	0	0

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