CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 564,906	$ 542,273	$ 1,639,689	$ 1,528,153
Cost of goods sold	393,111	388,236	1,143,397	1,093,412
Gross profit	171,795	154,037	496,292	434,741
Operating expenses:
Selling, general and administrative expenses	123,907	113,279	363,872	328,088
Depreciation and amortization	20,218	19,771	60,911	56,922
Total operating expenses	144,125	133,050	424,783	385,010
Income from operations	27,670	20,987	71,509	49,731
Loss on extinguishment of debt	0	(58,475)	0	(58,475)
Interest expense	(9,118)	(12,576)	(26,015)	(43,028)
Other (expense) income, net	(89)	(8)	(4)	126
Income (loss) before income taxes	18,463	(50,072)	45,490	(51,646)
Income tax expense (benefit)	5,754	(12,519)	13,232	(13,299)
Income (loss) from continuing operations	12,709	(37,553)	32,258	(38,347)
Income from discontinued operations, net of tax	0	2,772	0	7,913
Loss on sale of discontinued operations, net of tax	(11)	0	(1,401)	0
Net income (loss)	$ 12,698	$ (34,781)	$ 30,857	$ (30,434)
Earnings (loss) per share data:
Earnings (Loss) from continuing operations per share - basic (in dollars per share)	$ 0.30	$ (0.88)	$ 0.75	$ (0.89)
Earnings (Loss) from continuing operations per share - diluted (in dollars per share)	0.30	(0.88)	0.75	(0.89)
Earnings (loss) earnings from discontinued operations per share - basic (in dollars per share)	0.00	0.07	(0.03)	0.18
Earnings (loss) earnings from discontinued operations per share - diluted (in dollars per share)	0.00	0.07	(0.03)	0.18
Earnings per share - basic (in dollars per share)	0.30	(0.81)	0.72	(0.71)
Earnings per share - diluted (in dollars per share)	$ 0.30	$ (0.81)	$ 0.72	$ (0.71)
Weighted average shares outstanding:
Basic (in shares)	42,988,829	42,894,474	42,969,797	42,889,430
Diluted (in shares)	43,508,678	42,917,230	43,174,351	42,905,273
Comprehensive income (loss):
Net income (loss)	$ 12,698	$ (34,781)	$ 30,857	$ (30,434)
Foreign currency translation adjustment	(984)	1,481	2,317	(2,724)
Unrealized gain (loss) on derivatives, net of taxes of $0.1 million and $2.2 million respectively	344		(6,436)
Unrealized gain (loss) on derivatives, net of taxes of $0.5 million and $0.5 million, respectively, before 2017-12 adoption		(1,420)		839
Total other comprehensive (loss) income	(640)	61	(4,119)	(1,885)
Total comprehensive income (loss)	$ 12,058	$ (34,720)	$ 26,738	$ (32,319)