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Business Segment Information (Reconciliation of Total Operating Profit) (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 [Line Items] |  |  |  |
Total operating profit from segments | $ 127,362 | $ 114,730 | $ 385,424 | $ 335,811
Income from operations | 112,420 | 99,237 | 339,026 | 289,981
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating profit from segments | 127,362 | 114,730 | 385,424 | 335,811
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Corporate overhead expenses | $ (14,942) | $ (15,493) | $ (46,398) | $ (45,830)

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