Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Goodwill By Reportable Segment) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Segment Reporting Information
Net balance – December 31, 2016	$ 89,198
Acquisitions – 2017	5,614
Other	3,293
Net balance – March 31, 2017	98,105
OEM Segment
Segment Reporting Information
Net balance – December 31, 2016	74,663
Acquisitions – 2017	5,614
Other	3,286
Net balance – March 31, 2017	83,563
Aftermarket Segment
Segment Reporting Information
Net balance – December 31, 2016	14,535
Acquisitions – 2017	0
Other	7
Net balance – March 31, 2017	$ 14,542