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Earnings Per Share (Reconciliation Of Earnings Per Share) (Details) (USD $) In Thousands, except Per 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 for basic and diluted earnings per share	$ 16,276	$ 12,617	$ 41,164	$ 30,949
Weighted average shares outstanding - basic	36,923	37,118	36,903	37,358
Dilutive effect of stock options and restricted stock	142	170	146	146
Weighted average shares outstanding - diluted	37,065	37,288	37,049	37,504
Earnings per share - basic	$ 0.44	$ 0.34	$ 1.12	$ 0.83
Earnings per share - diluted	$ 0.44	$ 0.34	$ 1.11	$ 0.83

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