Acquisitions - Pro Forma Consolidated Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Revenues	$ 138,404	$ 136,086	$ 138,082	$ 129,577	$ 132,780	$ 128,808	$ 128,865	$ 119,236	$ 542,149	$ 509,689	$ 449,049
Sales, Pro Forma											454,333
Net income	$ 6,409	$ 4,818	$ 7,401	$ 5,174	$ 8,671	$ 7,764	$ 3,716	$ 2,823	$ 23,802	$ 22,974	16,570
Net income, Pro Forma											$ 17,112
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.14	$ 0.11	$ 0.17	$ 0.12	$ 0.20	$ 0.18	$ 0.09	$ 0.07	$ 0.54	$ 0.53	$ 0.39
Earnings per common share: basic, Pro Forma (in dollars per share)											0.40
Diluted (in dollars per share)	$ 0.14	$ 0.11	$ 0.17	$ 0.12	$ 0.20	$ 0.18	$ 0.09	$ 0.07	$ 0.53	$ 0.53	0.39
Earnings per common share: diluted, Pro Forma (in dollars per share)											$ 0.40