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Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total operating profit from segments | $ 136,874 | $ 127,362 | $ 397,179 | $ 385,424
Income from operations | 120,637 | 112,420 | 344,334 | 339,026
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating profit from segments | 136,874 | 127,362 | 397,179 | 385,424
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Corporate overhead expenses | $ (16,237) | $ (14,942) | $ (52,845) | $ (46,398)

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