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Business Segment (Summary of Information by Business Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | $ 2,056,829 |  | $ 2,056,829 |  | $ 1,886,241
External revenues | 3,042,738 | $ 3,382,507 | 8,538,762 | $ 9,771,257 |
Income (Loss) | 45,491 | 60,021 | 177,675 | 108,358 |
Net income | 45,491 | 60,531 | 177,675 | 109,654 |
Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | 2,056,829 |  | 2,056,829 |  |
External revenues | 3,042,738 | 3,382,507 | 8,538,762 | 9,771,257 |
Income (Loss) | 45,491 | 60,021 | 177,675 | 108,358 |
Discontinued Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | 0 |  | 0 |  |
External revenues | 0 | 0 | 0 | 0 |
Income (Loss) | 0 | 510 | 0 | 1,296 |
Operating Segments | Marketing | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | 1,778,818 |  | 1,778,818 |  |
External revenues | 3,042,727 | 3,382,500 | 8,538,535 | 9,770,989 |
Income (Loss) | 52,755 | 65,785 | 198,622 | 124,008 |
Corporate, Non-Segment | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | 278,011 |  | 278,011 |  |
External revenues | 11 | 7 | 227 | 268 |
Income (Loss) | $ (7,264) | $ (5,764) | $ (20,947) | $ (15,650) |

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