Supplementary Information - Quarterly Results of Operations (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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 109,140	$ 70,690	$ 59,695	$ 96,239	$ 94,931	$ 59,067	$ 48,546	$ 71,903	$ 335,764	$ 274,447	$ 218,803
Gross profit	52,480	36,209	30,656	53,889	48,519	28,795	24,780	38,481	173,234	140,575	106,477
Operating income (loss)	12,345	6,389	3,932	17,605	14,493	4,281	2,379	9,001	40,271	30,154	15,724
Income from continuing operations	9,852	3,873	2,219	10,859	10,473	2,664	1,498	5,748	26,803	20,383	48,124
Income (loss) from discontinued operation	(134)	(145)	205	(127)	(96)	(177)	(941)	(374)	(201)	(1,588)	(170)
Net income	$ 9,718	$ 3,728	$ 2,424	$ 10,732	$ 10,377	$ 2,487	$ 557	$ 5,374	$ 26,602	$ 18,795	$ 47,954
Basic	$ 0.31	$ 0.12	$ 0.08	$ 0.34	$ 0.33	$ 0.08	$ 0.02	$ 0.17	$ 0.85	$ 0.60	$ 1.54
Diluted	$ 0.31	$ 0.12	$ 0.08	$ 0.34	$ 0.33	$ 0.08	$ 0.02	$ 0.17	$ 0.84	$ 0.59	$ 1.52
Income tax benefit due to reduction of existing valuation allowance	$ 2,400									$ 1,200
Settlement and transaction related to acquisition expenses	$ 4,500