Net Income per Common Share (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 $ / shares shares	Sep. 30, 2014 $ / shares shares	Sep. 30, 2015 $ / shares shares	Sep. 30, 2014 item $ / shares shares
Net Income per Common Share
Weighted average common basic shares outstanding	22,205,707	21,997,394	22,159,701	21,989,131
Effect of dilutive stock options and restricted stock units	342,459	429,393	360,117	403,441
Weighted average common diluted shares outstanding	22,548,166	22,426,787	22,519,818	22,392,572
Net income (loss) per share
Basic (in dollars per share) | $ / shares	$ 0.17	$ 0.20	$ 0.67	$ 0.63
Diluted (in dollars per share) | $ / shares	$ 0.16	$ 0.19	$ 0.66	$ 0.62
Performance-based incentive programs | item				0
Potential shares of common stock attributable to stock options excluded from net income per common share calculation			0