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Goodwill- Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Carrying amount of goodwill by reportable segment
Increase (Decrease) in Other Current Assets									$ 3,808	$ (5,297)	$ 2,016
Amortization of Intangible Assets									(5,500)	(6,000)	(6,100)
Goodwill [Roll Forward]
Goodwill, Gross	$ 162,647				$ 161,018				162,647	161,018	161,221
Accumulated impairment losses	(30,768)				(30,768)				(30,768)	(30,768)	(24,081)
Goodwill	131,879				130,250				131,879	130,250	137,140
Goodwill acquired									1,815	913
Foreign exchange									134	(1,117)
Impairment of goodwill	0	$ 0	$ 0	$ 0	(6,686)	$ 0	$ 0	$ 0	0	(6,686)	0
Goodwill, Other Increase (Decrease)									320
North America
Carrying amount of goodwill by reportable segment
Increase (Decrease) in Other Current Assets									161
Goodwill [Roll Forward]
Goodwill, Gross	106,910				107,101				106,910	107,101	106,421
Accumulated impairment losses	(10,666)				(10,666)				(10,666)	(10,666)	(10,666)
Goodwill	96,244				96,435				96,244	96,435	95,755
Goodwill acquired									0	913
Foreign exchange									129	(233)
Impairment of goodwill									0	0
Goodwill, Other Increase (Decrease)									320
Europe
Goodwill [Roll Forward]
Goodwill, Gross	54,402				52,573				54,402	52,573	53,311
Accumulated impairment losses	(20,102)				(20,102)				(20,102)	(20,102)	(13,415)
Goodwill	34,300				32,471				34,300	32,471	39,896
Goodwill acquired									1,815	0
Foreign exchange									14	(739)
Impairment of goodwill										(6,686)
Goodwill, Other Increase (Decrease)									0
Asia/Pacific
Goodwill [Roll Forward]
Goodwill, Gross	1,335				1,344				1,335	1,344	1,489
Accumulated impairment losses	0				0				0	0	0
Goodwill	$ 1,335				$ 1,344				1,335	1,344	$ 1,489
Goodwill acquired									0	0
Foreign exchange									(9)	(145)
Impairment of goodwill										0
Goodwill, Other Increase (Decrease)									0
Patents
Carrying amount of goodwill by reportable segment
Amortization of Intangible Assets									(150)	(107)
Noncompete Agreements Trademarks and Other
Carrying amount of goodwill by reportable segment
Amortization of Intangible Assets									(1,910)	(1,757)
Reclassifications									(481)	$ 24
Noncompete Agreements Trademarks and Other | North America
Carrying amount of goodwill by reportable segment
Reclassifications									$ 481

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