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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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