Net Income Per Common Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Income Per Common Share
Weighted average common basic shares outstanding	21,889,777	15,665,263	21,880,274	15,614,868
Effect of dilutive stock options and restricted stock units (in shares)	331,325	235,396	315,679	245,800
Weighted average common diluted shares outstanding	22,221,102	15,900,659	22,195,953	15,860,668
Net income per share:
Basic (in dollars per share)	$ 0.16	$ 0.26	$ 0.15	$ 0.37
Diluted (in dollars per share)	$ 0.15	$ 0.26	$ 0.14	$ 0.37
Additional securities not included in the computation of diluted net income per share	0	0	0	0