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Earnings Per Common Share (Reconciliation Of The Numerator And Denominator Of Basic And Diluted Earnings Per Common Share) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Common Share
Net income	$ 9,996,000	$ 9,169,000	$ 27,591,000	$ 25,318,000
Net Income, Available to Common Stockholders, Basic, Total	9,996,000	9,169,000	27,591,000	25,318,000
Number of Shares Outstanding, Basic	66,710,000	66,039,000	66,544,000	65,946,000
Basic earnings per common share	$ 0.15	$ 0.14	$ 0.41	$ 0.38
Effect of Dilutive Securities Options	820,000	1,040,000	966,000	1,070,000
Net Income, Available to Common Stockholders, Diluted, Total	$ 9,996,000	$ 9,169,000	$ 27,591,000	$ 25,318,000
Number of Shares Outstanding, Diluted	67,530,000	67,079,000	67,510,000	67,016,000
Diluted earnings per common share	$ 0.15	$ 0.14	$ 0.41	$ 0.38

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