Net Income Per Common Share - Net Income Per Common Share Weighted average number of common shares outstanding during the period (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Weighted average common shares outstanding
Basic	33,588,720	33,597,020	34,584,558
Dilutive effect of stock options and restricted stock	454,705	512,212	158,985
Weighted average common shares outstanding diluted	34,043,425	34,109,232	34,743,543