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Earnings Per Share (Earnings Per Share Basic And Diluted) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share
Net income for basic and diluted earnings per share	$ 14,390	$ 9,630	$ 24,888	$ 18,332
Weighted average shares outstanding - basic	36,901	37,429	36,893	37,478
Dilutive effect of stock options and restricted stock	159	151	148	133
Weighted average shares outstanding - diluted	37,060	37,580	37,041	37,611
Earnings per share - basic	$ 0.39	$ 0.26	$ 0.67	$ 0.49
Earnings per share - diluted	$ 0.39	$ 0.26	$ 0.67	$ 0.49

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