Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 134,285	$ 140,560	$ 273,400	$ 293,128
Cost of sales	87,349	92,569	180,905	198,022
Gross profit	46,936	47,991	92,495	95,106
Selling, general and administrative expenses	36,809	34,506	71,277	69,979
(Gain) loss on disposal of fixed assets	(55)	66	(98)	(314)
Impairment charges	0	308	916	308
Operating income	10,182	13,111	20,400	25,133
Interest expense, net	1,017	1,313	2,066	2,952
Income from continuing operations before income taxes	9,165	11,798	18,334	22,181
Income tax expense	2,559	3,190	5,085	5,818
Income from continuing operations	6,606	8,608	13,249	16,363
Income (loss) from discontinued operations, net of income tax	0	0	127	(911)
Net income	$ 6,606	$ 8,608	$ 13,376	$ 15,452
Income per common share from continuing operations:
Basic	$ 0.19	$ 0.26	$ 0.37	$ 0.52
Diluted	0.18	0.26	0.37	0.51
Income (loss) per common share from discontinued operations:
Basic	0	0	0	(0.03)
Diluted	0	0	0	(0.03)
Net income per common share:
Basic	0.19	0.26	0.37	0.49
Diluted	$ 0.18	$ 0.26	$ 0.37	$ 0.48