Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 547,043	$ 534,379	$ 571,020
Cost of sales	389,590	372,481	395,158
Gross profit	157,453	161,898	175,862
Selling expenses	56,614	58,782	58,456
General and administrative expenses	78,889	73,797	82,333
Operating expenses excluding impairment charges	135,503	132,579	140,789
(Gain) loss on disposal of fixed assets	(3,482)	628	556
Impairment charges	544	1,329	0
Operating income	24,888	27,362	34,517
Interest
Income	(1,361)	(1,262)	(1,067)
Expense	8,653	9,905	10,076
Interest expense, net	7,292	8,643	9,009
Loss on extinguishment of debt	1,888	0	0
Income from continuing operations before income taxes	15,708	18,719	25,508
Income tax expense	4,864	7,395	8,037
Income from continuing operations	10,844	11,324	17,471
Income (loss) from discontinued operations, net of income tax	(20,733)	(10,267)	291
Net income (loss)	$ (9,889)	$ 1,057	$ 17,762
Income per common share from continuing operations:
Basic	$ 0.36	$ 0.38	$ 0.57
Diluted	0.35	0.38	0.56
Income (loss) per common share from discontinued operations:
Basic	(0.69)	(0.35)	0.01
Diluted	(0.68)	(0.35)	0.01
Net income (loss) per common share:
Basic	(0.33)	0.03	0.58
Diluted	(0.33)	0.03	0.57
Dividends declared per share	$ 0.54	$ 0.54	$ 0.54