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Segment Reporting (Schedule of Operating Profit by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information |  |
Operating profit | $ 101,431 | $ 44,266
Operating Segments | OEM Segment |  |
Segment Reporting Information |  |
Operating profit | 79,287 | 43,189
Operating Segments | Aftermarket Segment |  |
Segment Reporting Information |  |
Operating profit | $ 22,144 | $ 1,077

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