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Segment Reporting (Schedule of Operating Profit by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information |  |
Operating profit | $ 59,820 | $ 59,129
OEM Segment |  |
Segment Reporting Information |  |
Operating profit | 53,940 | 54,397
Aftermarket Segment |  |
Segment Reporting Information |  |
Operating profit | $ 5,880 | $ 4,732

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Period Type: |

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- Details
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