Goodwill and Definite and Indefinite-lived Intangible Assets (Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2017	$ 84,761
Translation adjustment	1,647
Goodwill adjusment	858
Balance at June 30, 2018	83,972
Industrial
Goodwill [Roll Forward]
Balance at December 31, 2017	61,682
Translation adjustment	361
Goodwill adjusment	84
Balance at June 30, 2018	61,405
Agricultural
Goodwill [Roll Forward]
Balance at December 31, 2017	6,357
Translation adjustment	864
Goodwill adjusment	774
Balance at June 30, 2018	6,267
European
Goodwill [Roll Forward]
Balance at December 31, 2017	16,722
Translation adjustment	422
Goodwill adjusment	0
Balance at June 30, 2018	$ 16,300