Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Goodwill By Reportable Segment) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Segment Reporting Information
Net balance – December 31, 2016	$ 89,198
Acquisitions – 2017	29,277
Other	4,526
Net balance – September 30, 2017	123,001
OEM Segment
Segment Reporting Information
Net balance – December 31, 2016	74,663
Acquisitions – 2017	29,277
Other	4,519
Net balance – September 30, 2017	108,459
Aftermarket Segment
Segment Reporting Information
Net balance – December 31, 2016	14,535
Acquisitions – 2017	0
Other	7
Net balance – September 30, 2017	$ 14,542