Acquisitions, Goodwill And Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets
Accumulated amortization	$ 158,616	$ 125,825
Total gross cost	579,501	467,251
Total net balance	420,885	341,426
OEM Segment
Finite-Lived Intangible Assets
Total net balance	260,778	164,047
Aftermarket Segment
Finite-Lived Intangible Assets
Total net balance	160,107	177,379
Purchased Research and Development
Finite-Lived Intangible Assets
Gross cost and net balance	4,687	4,687
Trade name
Finite-Lived Intangible Assets
Gross cost and net balance	7,600	7,600
Customer relationships
Finite-Lived Intangible Assets
Gross cost	398,613	319,934
Accumulated amortization	95,443	69,008
Net balance	$ 303,170	$ 250,926
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	17 years	17 years
Patents
Finite-Lived Intangible Assets
Gross cost	$ 92,128	$ 76,206
Accumulated amortization	47,090	44,611
Net balance	$ 45,038	$ 31,595
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	20 years	19 years
Trade name
Finite-Lived Intangible Assets
Gross cost	$ 69,686	$ 50,917
Accumulated amortization	11,272	7,086
Net balance	$ 58,414	$ 43,831
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	20 years	20 years
Non-compete agreements
Finite-Lived Intangible Assets
Gross cost	$ 6,478	$ 7,598
Accumulated amortization	4,617	4,947
Net balance	$ 1,861	$ 2,651
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	194	173
Net balance	$ 115	$ 136
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