Goodwill & Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill	$ 136,006	$ 186,980	$ 191,541
Accumulated impairment losses	(15,417)	(15,417)	(15,417)
Foreign currency translation	1,789	1,793
Purchase accounting adjustments		(1,327)
Divestitures	(16,824)	(7,681)
Total	120,589	171,563	176,124
Goodwill	35,939
North America
Goodwill [Roll Forward]
Goodwill	98,269	143,799	148,634
Accumulated impairment losses	(12,752)	(12,752)	(12,752)
Foreign currency translation	1,629	1,715
Purchase accounting adjustments		(1,131)
Divestitures	(11,220)	(7,681)
Total	85,517	131,047	135,882
Goodwill	35,939
EMEA
Goodwill [Roll Forward]
Goodwill	27,862	31,181	31,283
Accumulated impairment losses	(1,328)	(1,328)	(1,328)
Foreign currency translation	204	(33)
Purchase accounting adjustments		69
Divestitures	(3,523)	0
Total	26,534	29,853	29,955
Goodwill	0
Emerging Markets
Goodwill [Roll Forward]
Goodwill	9,875	12,000	11,624
Accumulated impairment losses	(1,337)	(1,337)	(1,337)
Foreign currency translation	(44)	111
Purchase accounting adjustments		(265)
Divestitures	(2,081)	0
Total	8,538	$ 10,663	$ 10,287
Goodwill	$ 0