Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 286,525	$ 270,850	$ 837,816	$ 827,356
Cost of goods sold	218,356	206,808	639,385	632,376
Gross profit	68,169	64,042	198,431	194,980
Operating expenses:
Selling, general and administrative expenses	59,938	56,142	174,404	176,312
Depreciation and amortization	3,090	3,265	8,939	10,438
Goodwill impairment	0	27,887	0	27,887
Intangible and other asset impairments	0	16,818	0	16,818
Restructuring charges	3,055	3,142	10,687	3,142
Income (loss) from operations	2,086	(43,212)	4,401	(39,617)
Other income (expense):
Interest income	37	19	239	135
Interest expense	(4,376)	(1,769)	(9,608)	(4,854)
Other expense	(1,736)	(301)	(2,196)	(1,734)
Total other expense	(6,075)	(2,051)	(11,565)	(6,453)
Loss before income taxes	(3,989)	(45,263)	(7,164)	(46,070)
Income tax expense (benefit)	(1,815)	(326)	(1,359)	851
Net loss	$ (2,174)	$ (44,937)	$ (5,805)	$ (46,921)
Basic and diluted net loss per share (in dollars per share)	$ (0.04)	$ (0.87)	$ (0.11)	$ (0.90)
Comprehensive loss	$ (3,910)	$ (46,646)	$ (6,541)	$ (50,872)