Business Segment Information (Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Segment Reporting Information [Line Items] | |||
Total operating profit from segments above | $ 460,778 | $ 435,011 | $ 412,664 |
Income from operations | 396,944 | 375,694 | 358,213 |
Operating Segments [Member] | |||
Segment Reporting Information [Line Items] | |||
Total operating profit from segments above | 460,778 | 435,011 | 412,664 |
Corporate, Non-Segment [Member] | |||
Segment Reporting Information [Line Items] | |||
Corporate overhead expenses | $ (63,834) | $ (59,317) | $ (54,451) |