CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Cost of sales	$ 120,475	$ 95,972	$ 250,128	$ 188,108
Gross margin	66,161	54,168	132,161	107,102
Net sales	186,636	150,140	382,289	295,210
Distribution expenses	18,931	15,192	37,577	31,749
Selling, general and administrative expenses	36,229	34,427	74,337	75,949
Restructuring expenses	0	253	0	253
Goodwill and other impairments	0	0	0	20,100
Income (loss) from operations	11,001	4,296	20,247	(20,949)
Interest expense	(3,819)	(4,230)	(7,833)	(8,966)
Mark to market gain (loss) on interest rate derivatives	46	(164)	544	(2,415)
Income (loss) before income taxes and equity in earnings (losses)	7,228	(98)	12,958	(32,330)
Income tax (provision) benefit	(1,832)	(3,031)	(4,248)	698
Equity in earnings (losses), net of taxes	393	(848)	146	(509)
NET INCOME (LOSS)	$ 5,789	$ (3,977)	$ 8,856	$ (32,141)
Basic income (loss) per common share (usd per share)	$ 0.27	$ (0.19)	$ 0.42	$ (1.55)
Diluted income (loss) per common share (usd per share)	$ 0.26	$ (0.19)	$ 0.40	$ (1.55)