CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 2,044,312	$ 1,790,114
Cost of goods sold	1,453,953	1,267,925
Gross profit	590,359	522,189
Operating expenses:
Selling, general and administrative expenses	444,527	399,864
Depreciation and amortization	77,419	70,861
Total operating expenses	521,946	470,725
Income from operations	68,413	51,464
Loss on extinguishment of debt	(58,475)	0
Interest expense	(53,283)	(61,011)
Other income, net	1,298	81,488
(Loss) income before income taxes	(42,047)	71,941
Income tax benefit	(5,628)	(5,965)
(Loss) income from continuing operations	(36,419)	77,906
Income from discontinued operations, net of tax	10,523	4,574
Gain on sale of discontinued operations, net of tax	13,713	0
Net (loss) income	$ (12,183)	$ 82,480
(Loss) earnings per share data:
(Loss) earnings from continuing operations per share - basic (in dollars per share)	$ (0.85)	$ 1.88
(Loss) earnings from continuing operations per share - diluted (in dollars per share)	(0.85)	1.88
Earnings from discontinued operations per share - basic (in dollars per share)	0.57	0.11
Earnings from discontinued operations per share - diluted (in dollars per share)	0.57	0.11
Earnings (loss) earnings per share - basic (in dollars per share)	(0.28)	1.99
Earnings (loss) per share - diluted (in dollars per share)	$ (0.28)	$ 1.99
Weighted average shares outstanding:
Basic (in shares)	42,892,879,000	41,486,496,000
Diluted (in shares)	42,915,028,000	41,490,653,000
Comprehensive (loss) income:
Net (loss) income	$ (12,183)	$ 82,480
Foreign currency translation adjustment	(6,948)	5,327
Unrealized gain (loss) on derivative, net of taxes of $2.0 million and $1.8 million, respectively	4,413	(2,970)
Total other comprehensive (loss) income	(2,535)	2,357
Total comprehensive (loss) income	$ (14,718)	$ 84,837