Goodwill and Definite and Indefinite-lived Intangible Assets (Definite and Indefinite Lived Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]
Definite intangible assets	$ 58,372		$ 58,372		$ 58,912
Less accumulated amortization	(14,109)		(14,109)		(11,540)
Total net	44,263		44,263		47,372
Intangible assets, net	49,763		49,763		52,872
Amortization of intangibles	874	$ 891	2,630	$ 2,445
Intangible assets, net	49,763		$ 49,763		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		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	23,966		$ 23,966		24,276
Customer and dealer relationships
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]
Definite intangible assets	32,435		$ 32,435		32,654
Customer and dealer relationships | Minimum
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]
Estimated Useful Lives			10 years
Customer and dealer relationships | Maximum
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]
Estimated Useful Lives			14 years
Patents and drawings
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]
Definite intangible assets	$ 1,971		$ 1,971		$ 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