Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 152,568	$ 136,572
Cost of sales	105,453	94,811
Gross profit	47,115	41,761
Selling, general and administrative expenses	35,473	34,539
(Gain) loss on disposal of fixed assets	(380)	(894)
Operating income	12,022	8,116
Interest expense, net	1,639	2,130
Income from continuing operations before income taxes	10,383	5,986
Income tax expense	2,628	2,528
Income from continuing operations	7,755	3,458
Income (loss) from discontinued operations, net of income tax	(911)	(344)
Net income	$ 6,844	$ 3,114
Income per common share from continuing operations:
Basic	$ 0.25	$ 0.12
Diluted	0.25	0.11
Income (loss) per common share from discontinued operations:
Basic	(0.03)	(0.02)
Diluted	(0.03)	(0.01)
Net income per common share:
Basic	0.22	0.10
Diluted	0.22	0.10
Dividends declared per share	$ 0.14	$ 0.14