Segment Reporting (Schedule of Operating Profit by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information
Operating profit	$ 44,266	$ 47,755
Operating Segments \| OEM Segment
Segment Reporting Information
Operating profit	43,189	40,408
Operating Segments \| Aftermarket Segment
Segment Reporting Information
Operating profit	$ 1,077	$ 7,347

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