Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 515,698	$ 566,735	$ 547,043
Cost of sales	344,386	387,442	389,590
Gross profit	171,312	179,293	157,453
Selling expenses	56,350	59,503	56,614
General and administrative expenses	76,780	79,832	78,889
Operating expenses excluding impairment charges	133,130	139,335	135,503
(Gain) loss on disposal of fixed assets	0	(8)	(3,482)
Impairment charges	916	308	544
Other expenses		33,331
Operating income	37,266	6,327	24,888
Interest income	(808)	(1,221)	(1,361)
Interest expense	4,891	6,159	8,653
Interest expense, net	4,083	4,938	7,292
Loss on extinguishment of debt	0	0	1,888
Income from continuing operations before income taxes	33,183	1,389	15,708
Income tax expense	8,968	3,037	4,864
Income (loss) from continuing operations	24,215	(1,648)	10,844
Income (loss) from discontinued operations, net of income tax	118	(1,701)	(20,733)
Net income (loss)	$ 24,333	$ (3,349)	$ (9,889)
Income (loss) per common share from continuing operations:
Basic	$ 0.68	$ (0.05)	$ 0.36
Diluted	0.68	(0.05)	0.35
Income (loss) per common share from discontinued operations:
Basic	0	(0.05)	(0.69)
Diluted	0	(0.05)	(0.68)
Net income (loss) per common share:
Basic	0.68	(0.10)	(0.33)
Diluted	0.68	(0.10)	(0.33)
Dividends declared per share	$ 0.54	$ 0.54	$ 0.54