Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Goodwill By Reportable Segment) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Segment Reporting Information
Net balance – beginning of period	$ 180,168
Other	(1,832)
Net balance – end of period	178,336
OEM Segment
Segment Reporting Information
Net balance – beginning of period	160,257
Other	(1,732)
Net balance – end of period	158,525
Aftermarket Segment
Segment Reporting Information
Net balance – beginning of period	19,911
Other	(100)
Net balance – end of period	$ 19,811