Acquisitions, Goodwill And Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Accumulated amortization	$ 104,764	$ 90,658
Indefinite-lived Intangible Assets
Total gross cost	281,106	220,790
Total net balance	176,342	130,132
Trade name
Indefinite-lived Intangible Assets
Gross cost and net balance	7,600
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	159,803	116,648
Aftermarket Segment
Indefinite-lived Intangible Assets
Total net balance	16,539	13,484
Customer relationships
Finite-Lived Intangible Assets
Gross cost	191,919	138,687
Accumulated amortization	54,889	42,276
Net balance	$ 137,030	$ 96,411
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	$ 58,787	$ 57,576
Accumulated amortization	40,079	38,764
Net balance	$ 18,708	$ 18,812
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
Trade name
Finite-Lived Intangible Assets
Gross cost	$ 10,885	$ 10,995
Accumulated amortization	5,507	5,381
Net balance	$ 5,378	$ 5,614
Trade name | Minimum
Finite-Lived Intangible Assets
Estimated useful life in years	3 years	3 years
Trade name | Maximum
Finite-Lived Intangible Assets
Estimated useful life in years	15 years	15 years
Non-compete agreements
Finite-Lived Intangible Assets
Gross cost	$ 6,919	$ 8,536
Accumulated amortization	4,148	4,128
Net balance	$ 2,771	$ 4,408
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	$ 309
Accumulated amortization	141	109
Net balance	$ 168	$ 200
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