Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Goodwill By Reportable Segment) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Segment Reporting Information
Net balance – beginning of period	$ 180,168
Acquisitions	27,046
Other	(3,709)
Net balance – end of period	203,505
OEM Segment
Segment Reporting Information
Net balance – beginning of period	160,257
Acquisitions	18,204
Other	(3,609)
Net balance – end of period	174,852
Aftermarket Segment
Segment Reporting Information
Net balance – beginning of period	19,911
Acquisitions	8,842
Other	(100)
Net balance – end of period	$ 28,653