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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
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Common Share [Abstract]
Net income	$ 8,578,000	$ 7,767,000
Basic earnings per common share, Income	8,578,000	7,767,000
Basic earnings per common share, Shares	67,084,000	66,401,000
Basic earnings per common share	$ 0.13	$ 0.12
Net Income, Available to Common Stockholders, Diluted, Total	$ 8,578,000	$ 7,767,000
Effect of dilutive securities Options	1,001,000	1,053,000
Number of Shares Outstanding, Diluted	68,085,000	67,454,000
Diluted earnings per common share	$ 0.13	$ 0.12

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