Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 140,560	$ 135,252	$ 293,128	$ 271,824
Cost of sales	92,569	96,960	198,022	191,771
Gross profit	47,991	38,292	95,106	80,053
Selling, general and administrative expenses	34,506	32,133	69,979	66,672
(Gain) loss on disposal of fixed assets	66	(353)	(314)	(1,247)
Impairment charges	308	544	308	544
Operating income	13,111	5,968	25,133	14,084
Interest expense, net	1,313	1,860	2,952	3,990
Income from continuing operations before income taxes	11,798	4,108	22,181	10,094
Income tax expense	3,190	1,626	5,818	4,154
Income from continuing operations	8,608	2,482	16,363	5,940
Income (loss) from discontinued operations, net of income tax	0	(489)	(911)	(833)
Net income	$ 8,608	$ 1,993	$ 15,452	$ 5,107
Income per common share from continuing operations:
Basic	$ 0.26	$ 0.08	$ 0.52	$ 0.20
Diluted	0.26	0.08	0.51	0.20
Income (loss) per common share from discontinued operations:
Basic	0	(0.01)	(0.03)	(0.03)
Diluted	0	(0.01)	(0.03)	(0.03)
Net income per common share:
Basic	0.26	0.07	0.49	0.17
Diluted	0.26	0.07	0.48	0.17
Dividends declared per share	$ 0.14	$ 0.14	$ 0.27	$ 0.27