Net Income Per Common Share (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of Basic and diluted weighted average common shares
Basic weighted average common shares outstanding	22,398	22,620	22,573	22,672
Weighted average common equivalent shares	460	462	445	507
Diluted weighted average common shares outstanding	22,858	23,082	23,018	23,179
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive	967	447	644	209