CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 486,090	$ 559,911	$ 1,010,348	$ 1,074,783
Cost of goods sold	340,435	388,374	702,535	750,286
Gross profit	145,655	171,537	307,813	324,497
Operating expenses:
Selling, general and administrative expenses	106,257	122,735	229,354	239,965
Depreciation and amortization	19,288	20,351	38,507	40,693
Total operating expenses	125,545	143,086	267,861	280,658
Income from operations	20,110	28,451	39,952	43,839
Interest expense	(7,153)	(8,341)	(14,886)	(16,897)
Gain on legal settlement	0	0	8,556	0
Other income (expense), net	547	44	(475)	85
Income before income taxes	13,504	20,154	33,147	27,027
Income tax expense	3,647	5,433	8,914	7,478
Income from continuing operations	9,857	14,721	24,233	19,549
Loss on sale of discontinued operations, net of tax	0	(44)	0	(1,390)
Net income	$ 9,857	$ 14,677	$ 24,233	$ 18,159
Earnings per share data:
Earnings from continuing operations per share - basic (in dollars per share)	$ 0.23	$ 0.34	$ 0.56	$ 0.45
Earnings from continuing operations per share - diluted (in dollars per share)	0.23	0.34	0.56	0.45
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)	0.23	0.34	0.56	0.42
Earnings per share - diluted (in dollars per share)	$ 0.23	$ 0.34	$ 0.56	$ 0.42
Weighted average shares outstanding:
Basic (in shares)	43,203,894	42,987,915	43,124,793	42,960,124
Diluted (in shares)	43,332,225	43,245,353	43,440,723	43,064,496
Comprehensive income:
Net income	$ 9,857	$ 14,677	$ 24,233	$ 18,159
Foreign currency translation adjustment	3,134	1,731	(3,909)	3,301
Unrealized loss on derivatives, net of taxes of $0.4 million and $1.0 million, respectively and $0.5 million and $2.3 million, respectively	(1,026)	(3,284)	(1,525)	(6,780)
Total other comprehensive income (loss)	2,108	(1,553)	(5,434)	(3,479)
Total comprehensive income	$ 11,965	$ 13,124	$ 18,799	$ 14,680