CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 2,154,530	$ 2,044,312
Cost of goods sold	1,497,921	1,453,953
Gross profit	656,609	590,359
Operating expenses:
Selling, general and administrative expenses	487,865	444,527
Depreciation and amortization	80,444	77,419
Total operating expenses	568,309	521,946
Income from operations	88,300	68,413
Loss on extinguishment of debt	0	(58,475)
Interest expense	(33,788)	(53,283)
Other income, net	443	1,298
Income (loss) before income taxes	54,955	(42,047)
Income tax expense (benefit)	13,127	(5,628)
Income (loss) from continuing operations	41,828	(36,419)
Income from discontinued operations, net of tax	0	10,523
(Loss) gain on sale of discontinued operations, net of tax	(1,589)	13,713
Net income (loss)	$ 40,239	$ (12,183)
Earnings (loss) per share data:
Earnings (loss) from continuing operations per share - basic (in dollar per share)	$ 0.97	$ (0.85)
Earnings (loss) from continuing operations per share - diluted (in dollar per share)	0.97	(0.85)
(Loss) earnings from discontinued operations per share - basic (in dollar per share)	(0.03)	0.57
(Loss) earnings from discontinued operations per share - diluted (in dollar per share)	(0.04)	0.57
Earnings (loss) per share - basic (in dollars per share)	0.94	(0.28)
Earnings (loss) per share - diluted (in dollars per share)	$ 0.93	$ (0.28)
Weighted average shares outstanding:
Basic (in shares)	42,975,026	42,892,879
Diluted (in shares)	43,307,528	42,915,028
Comprehensive income (loss):
Net income (loss)	$ 40,239	$ (12,183)
Foreign currency translation adjustment	3,933	(6,948)
Unrealized (loss) gain on derivative, net of taxes of $2.3 million	(6,216)
Unrealized gain (loss) on derivative, net of taxes of $2.0 million, before 2017-12 adoption		4,413
Total other comprehensive loss	(2,283)	(2,535)
Total comprehensive income (loss)	$ 37,956	$ (14,718)