Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Goodwill By Reportable Segment) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Segment Reporting Information
Net balance – beginning of period	$ 180,168
Acquisitions	4,791
Other	(2,735)
Net balance – end of period	182,224
OEM Segment
Segment Reporting Information
Net balance – beginning of period	160,257
Acquisitions	4,791
Other	(2,635)
Net balance – end of period	162,413
Aftermarket Segment
Segment Reporting Information
Net balance – beginning of period	19,911
Acquisitions	0
Other	(100)
Net balance – end of period	$ 19,811