CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 536,297	$ 479,457
Cost of goods sold	381,857	339,546
Gross profit	154,440	139,911
Operating expenses:
Selling, general and administrative	121,427	113,062
Depreciation and amortization	19,886	18,396
Total operating expenses	141,313	131,458
Income from operations	13,127	8,453
Interest expense	(15,132)	(15,249)
Other income, net	67	13,289
(Loss) income before income taxes	(1,938)	6,493
Income tax (benefit) expense	(885)	2,564
Net (loss) income	$ (1,053)	$ 3,929
(Loss) earnings per share data:
Basic (in dollars per share)	$ (0.02)	$ 0.11
Diluted (in dollars per share)	$ (0.02)	$ 0.11
Weighted average shares outstanding:
Basic (in shares)	42,879,874	37,273,156
Diluted (in shares)	42,879,874	37,273,156
Comprehensive (loss) income:
Foreign currency translation adjustment	$ (2,371)	$ 573
Unrealized gain (loss) on derivative, net of taxes of $0.5 million and $0.3 million, respectively.	1,163	(461)
Total other comprehensive (loss) income	(1,208)	112
Total comprehensive (loss) income	$ (2,261)	$ 4,041