Acquisitions, Goodwill And Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets
Accumulated amortization	$ 75,198	$ 66,627
Net balance	17,758	16,055	$ 12,704
Indefinite-lived Intangible Assets
Total gross cost	188,141	167,562
Total net balance	112,943	100,935
Purchased Research and Development
Indefinite-lived Intangible Assets
Gross cost and net balance	4,687	4,687
OEM Segment
Indefinite-lived Intangible Assets
Total net balance	97,689	84,752
Aftermarket Segment
Indefinite-lived Intangible Assets
Total net balance	15,254	16,183
Customer Relationships
Finite-Lived Intangible Assets
Gross cost	110,784	94,560
Accumulated amortization	32,414	30,514
Net balance	$ 78,370	$ 64,046
Customer Relationships | Minimum
Finite-Lived Intangible Assets
Estimated useful life in years	6 years	6 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets
Estimated useful life in years	16 years	16 years
Patents
Finite-Lived Intangible Assets
Gross cost	$ 56,468	$ 54,293
Accumulated amortization	34,066	28,255
Net balance	$ 22,402	$ 26,038
Patents | Minimum
Finite-Lived Intangible Assets
Estimated useful life in years	3 years	3 years
Patents | Maximum
Finite-Lived Intangible Assets
Estimated useful life in years	19 years	19 years
Tradenames
Finite-Lived Intangible Assets
Gross cost	$ 10,041	$ 8,935
Accumulated amortization	5,667	4,751
Net balance	$ 4,374	$ 4,184
Tradenames | Minimum
Finite-Lived Intangible Assets
Estimated useful life in years	3 years	3 years
Tradenames | Maximum
Finite-Lived Intangible Assets
Estimated useful life in years	15 years	15 years
Non-compete Agreements
Finite-Lived Intangible Assets
Gross cost	$ 5,852	$ 4,493
Accumulated amortization	2,975	2,800
Net balance	$ 2,877	$ 1,693
Non-compete Agreements | Minimum
Finite-Lived Intangible Assets
Estimated useful life in years	3 years	3 years
Non-compete Agreements | Maximum
Finite-Lived Intangible Assets
Estimated useful life in years	6 years	6 years
Other
Finite-Lived Intangible Assets
Gross cost	$ 309	$ 594
Accumulated amortization	76	307
Net balance	$ 233	$ 287
Other | Minimum
Finite-Lived Intangible Assets
Estimated useful life in years	2 years	2 years
Other | Maximum
Finite-Lived Intangible Assets
Estimated useful life in years	12 years	12 years