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v3.19.1

Segment Reporting (Schedule of Operating Profit by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information |  |
Operating profit | $ 47,755 | $ 59,820
Operating Segments | OEM Segment |  |
Segment Reporting Information |  |
Operating profit | 40,408 | 53,940
Operating Segments | Aftermarket Segment |  |
Segment Reporting Information |  |
Operating profit | $ 7,347 | $ 5,880

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