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Net Income Per Common Share (Details) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of basic and diluted weighted average common shares
Basic weighted average common shares outstanding	22,306	22,738
Weighted average common equivalent shares	352	435
Diluted weighted average common shares outstanding	22,658	23,173
Options excluded from diluted weight average share calculation as effect would have been anti-dilutive	1,198	406

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