Goodwill and Definite- and Indefinite-lived Intangible Assets (Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2017	$ 84,761
Translation adjustments	272
Balance at March 31, 2018	85,033
Industrial
Goodwill [Roll Forward]
Balance at December 31, 2017	61,682
Translation adjustments	(213)
Balance at March 31, 2018	61,469
Agricultural
Goodwill [Roll Forward]
Balance at December 31, 2017	6,357
Translation adjustments	2
Balance at March 31, 2018	6,359
European
Goodwill [Roll Forward]
Balance at December 31, 2017	16,722
Translation adjustments	483
Balance at March 31, 2018	$ 17,205