Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 566,735	$ 547,043	$ 534,379
Cost of sales	387,442	389,590	372,481
Gross profit	179,293	157,453	161,898
Selling expenses	59,503	56,614	58,782
General and administrative expenses	79,832	78,889	73,797
Operating expenses excluding impairment charges	139,335	135,503	132,579
(Gain) loss on disposal of fixed assets	(8)	(3,482)	628
Impairment charges	308	544	1,329
Other expenses	33,331
Operating income	6,327	24,888	27,362
Interest
Income	(1,221)	(1,361)	(1,262)
Expense	6,159	8,653	9,905
Interest expense, net	4,938	7,292	8,643
Loss on extinguishment of debt	0	1,888	0
Income from continuing operations before income taxes	1,389	15,708	18,719
Income tax expense	3,037	4,864	7,395
Income (loss) from continuing operations	(1,648)	10,844	11,324
Income (loss) from discontinued operations, net of income tax	(1,701)	(20,733)	(10,267)
Net income (loss)	$ (3,349)	$ (9,889)	$ 1,057
Income (loss) per common share from continuing operations:
Basic	$ (0.05)	$ 0.36	$ 0.38
Diluted	(0.05)	0.35	0.38
Income (loss) per common share from discontinued operations:
Basic	(0.05)	(0.69)	(0.35)
Diluted	(0.05)	(0.68)	(0.35)
Net income (loss) per common share:
Basic	(0.10)	(0.33)	0.03
Diluted	(0.10)	(0.33)	0.03
Dividends declared per share	$ 0.54	$ 0.54	$ 0.54