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Segment Reporting (Schedule of Operating Profit by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information
Operating profit	$ 89,024	$ 94,433	$ 284,437	$ 159,481
Operating Segments | OEM Segment
Segment Reporting Information
Operating profit	64,136	65,533	206,757	110,485
Operating Segments | Aftermarket Segment
Segment Reporting Information
Operating profit	$ 24,888	$ 28,900	$ 77,680	$ 48,996

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The net result for the period of deducting operating expenses from operating revenues.

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