Net Income Per Common Share Weighted average number of common shares outstanding during the period (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Options to purchase common stock outstanding (in shares)	212,000	692,810	212,000	1,159,679
Weighted average common shares outstanding
Basic (in shares)	33,746,824	34,354,210	33,592,984	34,938,806
Dilutive effect of stock options and restricted stock (in shares)	664,830	106,742	663,469	89,607
Weighted average common shares outstanding diluted (in shares)	34,411,654	34,460,952	34,256,453	35,028,413