Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 135,219	$ 135,113	$ 428,347	$ 406,937
Cost of sales	93,128	95,970	291,150	287,741
Gross profit	42,091	39,143	137,197	119,196
Selling, general and administrative expenses	34,381	35,107	104,360	101,779
(Gain) loss on disposal of fixed assets	218	(2,765)	(96)	(4,012)
Impairment charges	0	0	308	544
Other expenses	33,331	0	33,331	0
Operating income (loss)	(25,839)	6,801	(706)	20,885
Interest expense, net	883	1,838	3,835	5,828
Income (loss) from continuing operations before income taxes	(26,722)	4,963	(4,541)	15,057
Income tax expense (benefit)	(5,585)	1,880	233	6,034
Income (loss) from continuing operations	(21,137)	3,083	(4,774)	9,023
Income (loss) from discontinued operations, net of income tax	(2)	174	(913)	(659)
Net income (loss)	$ (21,139)	$ 3,257	$ (5,687)	$ 8,364
Income (loss) per common share from continuing operations:
Basic	$ (0.60)	$ 0.10	$ (0.15)	$ 0.30
Diluted	(0.60)	0.10	(0.15)	0.30
Income (loss) per common share from discontinued operations:
Basic	0	0.01	(0.02)	(0.02)
Diluted	0	0.01	(0.02)	(0.02)
Net income (loss) per common share:
Basic	(0.60)	0.11	(0.17)	0.28
Diluted	(0.60)	0.11	(0.17)	0.28
Dividends declared per share	$ 0.14	$ 0.14	$ 0.41	$ 0.41