Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance	$ 59,971	$ 59,219
Foreign currency translation	(903)	752
Ending balance	59,068	59,971
Distribution [Member]
Goodwill [Roll Forward]
Beginning balance	505	505
Foreign currency translation	0	0
Ending balance	505	505
Material Handling [Member]
Goodwill [Roll Forward]
Beginning balance	59,466	58,714
Foreign currency translation	(903)	752
Ending balance	$ 58,563	$ 59,466