Acquisitions, Goodwill And Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill
Net balance, Beginning	$ 83,619
Net balance, Ending	89,198	$ 83,619
Operating Segments
Goodwill
Net balance, Beginning	83,619	66,521
Acquisitions	5,797	17,098
Other	(218)
Net balance, Ending	89,198	83,619
Operating Segments | OEM Segment
Goodwill
Net balance, Beginning	69,822	52,815
Acquisitions	5,059	17,007
Other	(218)
Net balance, Ending	74,663	69,822
Operating Segments | Aftermarket Segment
Goodwill
Net balance, Beginning	13,797	13,706
Acquisitions	738	91
Other	0
Net balance, Ending	$ 14,535	$ 13,797