Goodwill and Definite- and Indefinite-lived Intangible Assets (Definite and Indefinite Lived Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]
Definite intangible assets	$ 58,773		$ 58,912
Less accumulated amortization	(12,385)		(11,540)
Total net	46,388		47,372
Total Intangible Assets	51,888		52,872
Amortization of intangibles	881	$ 777
Intangible assets, net	$ 51,888		52,872
Total assets | Indefinite-lived and Finite-Lived Intangible Assets
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]
Percentage of total assets	7.00%
Trade names and trademarks
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]
Indefinite intangible assets	$ 5,500		5,500
Trade names and trademarks
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]
Estimated Useful Lives	25 years
Definite intangible assets	$ 24,245		24,276
Customer and dealer relationships
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]
Estimated Useful Lives	14 years
Definite intangible assets	$ 32,556		32,654
Patents and drawings
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]
Definite intangible assets	$ 1,972		$ 1,982
Patents and drawings | Minimum
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]
Estimated Useful Lives	3 years
Patents and drawings | Maximum
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]
Estimated Useful Lives	12 years