Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Revenue	$ 1,121,551	$ 1,138,361	$ 1,094,402
Cost of Goods and Services Sold	866,453	862,903	831,838
Gross profit	255,098	275,458	262,564
Operating expenses:
Selling, general and administrative expenses	239,124	227,253	209,524
Depreciation and amortization	12,988	13,390	17,916
Change in fair value of contingent consideration	0	677	10,417
Goodwill Impairment	46,319	0	0
Intangible and other asset impairments	18,121	0	70
Restructuring charges	6,031	0	5,615
(Loss) income from operations	(67,485)	34,138	19,022
Other income (expense):
Interest income	218	97	86
Interest expense	(7,749)	(4,729)	(4,171)
Other, net	(1,616)	(1,788)	(154)
Total other expense	(9,147)	(6,420)	(4,239)
(Loss) income before taxes	(76,632)	27,718	14,783
(Benefit) provision for income tax	$ (461)	$ 11,288	$ 10,834
Basic earnings (loss) per share (in USD per share)	$ (1.46)	$ 0.31	$ 0.07
Diluted earnings (loss) per share (in USD per share)	$ (1.46)	$ 0.30	$ 0.07