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Segment Reporting (Schedule of Operating Profit by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information |  |  |  |
Operating profit | $ 45,353 | $ 47,927 | $ 169,261 | $ 170,096
Operating Segments | OEM Segment |  |  |  |
Segment Reporting Information |  |  |  |
Operating profit | 36,905 | 41,025 | 144,436 | 151,867
Operating Segments | Aftermarket Segment |  |  |  |
Segment Reporting Information |  |  |  |
Operating profit | $ 8,448 | $ 6,902 | $ 24,825 | $ 18,229

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