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Segment Information (Summary Of Segment Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 517,920 | $ 511,728 | $ 506,648 | $ 492,887 | $ 509,694 | $ 506,504 | $ 521,812 | $ 498,376 | $ 2,029,183 | $ 2,036,386 | $ 2,002,850
Operating Income | 36,089 | 32,583 | 42,361 | 28,693 | 43,124 | 41,805 | 51,113 | 35,402 | 139,726 | 171,444 | 173,674
Truckload Transportation Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,657,854 | 1,699,349 | 1,694,965
Operating Income |  |  |  |  |  |  |  |  | 119,597 | 153,142 | 157,604
Value Added Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 361,384 | 324,155 | 292,813
Operating Income |  |  |  |  |  |  |  |  | 14,664 | 15,999 | 17,036
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 11,342 | 11,782 | 12,367
Operating Income |  |  |  |  |  |  |  |  | 3,947 | 1,212 | (383)
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,081 | 4,322 | 4,409
Operating Income |  |  |  |  |  |  |  |  | 1,518 | 1,091 | (583)
Subtotal [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,033,661 | 2,039,608 | 2,004,554
Inter-segment eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ (4,478) | $ (3,222) | $ (1,704)

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