CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 521,261	$ 564,906	$ 1,531,609	$ 1,639,689
Cost of goods sold	366,846	393,111	1,069,381	1,143,397
Gross profit	154,415	171,795	462,228	496,292
Operating expenses:
Selling, general and administrative expenses	115,125	123,907	344,479	363,872
Depreciation and amortization	19,413	20,218	57,920	60,911
Total operating expenses	134,538	144,125	402,399	424,783
Income from operations	19,877	27,670	59,829	71,509
Interest expense	(6,463)	(9,118)	(21,349)	(26,015)
Gain on legal settlement	0	0	8,556	0
Other income (expense), net	436	(89)	(39)	(4)
Income before income taxes	13,850	18,463	46,997	45,490
Income tax expense	2,049	5,754	10,963	13,232
Income from continuing operations	11,801	12,709	36,034	32,258
Loss on sale of discontinued operations, net of tax	0	(11)	0	(1,401)
Net income	$ 11,801	$ 12,698	$ 36,034	$ 30,857
Earnings per share data:
Earnings from continuing operations per share - basic (in dollars per share)	$ 0.27	$ 0.30	$ 0.83	$ 0.75
Earnings from continuing operations per share - diluted (in dollars per share)	0.27	0.30	0.83	0.75
Loss from discontinued operations per share - basic (in dollars per share)	0	0	0	(0.03)
Loss from discontinued operations per share - diluted (in dollars per share)	0	0	0	(0.03)
Earnings per share - basic (in dollars per share)	0.27	0.30	0.83	0.72
Earnings per share - diluted (in dollars per share)	$ 0.27	$ 0.30	$ 0.83	$ 0.72
Weighted average shares outstanding:
Basic (in shares)	43,206,505	42,988,829	43,152,229	42,969,797
Diluted (in shares)	43,565,493	43,508,678	43,478,442	43,174,351
Comprehensive income:
Net income	$ 11,801	$ 12,698	$ 36,034	$ 30,857
Foreign currency translation adjustment	1,731	(984)	(2,178)	2,317
Unrealized (loss) gain on derivatives, net of taxes of $0 million and $0.1 million, respectively and $0.6 million and $2.2 million, respectively	(7)	344	(1,532)	(6,436)
Total other comprehensive income (loss)	1,724	(640)	(3,710)	(4,119)
Total comprehensive income	$ 13,525	$ 12,058	$ 32,324	$ 26,738