Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 270,850	$ 288,523	$ 827,356	$ 832,994
Cost of goods sold	206,808	216,602	632,376	626,323
Gross profit	64,042	71,921	194,980	206,671
Operating expenses:
Selling, general and administrative expenses	56,142	57,186	176,312	165,855
Depreciation and amortization	3,265	3,317	10,438	9,403
Change in fair value of contingent consideration	0	(167)	0	677
Goodwill, Impairment Loss	27,887	0	27,887	0
Impairment of Intangible Assets, Finite-lived	16,818	0	16,818	0
Restructuring Charges	3,142	0	3,142	0
(Loss) income from operations	(43,212)	11,585	(39,617)	30,736
Other income (expense):
Interest income	19	31	135	77
Interest expense	(1,769)	(1,198)	(4,854)	(3,239)
Other, net	(301)	426	(1,734)	(962)
Total other expense	(2,051)	(741)	(6,453)	(4,124)
(Loss) income before income taxes	(45,263)	10,844	(46,070)	26,612
Income tax (benefit) expense	(326)	3,728	851	9,444
Net (loss) income	$ (44,937)	$ 7,116	$ (46,921)	$ 17,168
Basic earnings (loss) per share (in dollars per share)	$ (0.87)	$ 0.13	$ (0.90)	$ 0.32
Diluted earnings (loss) per share (in dollars per share)	$ (0.87)	$ 0.13	$ (0.90)	$ 0.31
Comprehensive (loss) income	$ (46,646)	$ 9,284	$ (50,872)	$ 25,196