Segment Information (Summary Of Segment Information) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2012
|
Sep. 30, 2012
|
Jun. 30, 2012
|
Mar. 31, 2012
|
Dec. 31, 2011
|
Sep. 30, 2011
|
Jun. 30, 2011
|
Mar. 31, 2011
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
Segment Reporting Information [Line Items] | |||||||||||
Revenues | $ 509,694 | $ 506,504 | $ 521,812 | $ 498,376 | $ 507,937 | $ 509,587 | $ 515,897 | $ 469,429 | $ 2,036,386 | $ 2,002,850 | $ 1,815,020 |
Operating Income | 43,124 | 41,805 | 51,113 | 35,402 | 49,399 | 50,066 | 46,767 | 27,442 | 171,444 | 173,674 | 134,582 |
Truckload Transportation Services [Member]
|
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Segment Reporting Information [Line Items] | |||||||||||
Revenues | 1,699,349 | 1,694,965 | 1,550,601 | ||||||||
Operating Income | 153,142 | 157,604 | 122,208 | ||||||||
Value Added Services [Member]
|
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Segment Reporting Information [Line Items] | |||||||||||
Revenues | 320,933 | 291,109 | 250,983 | ||||||||
Operating Income | 15,999 | 17,036 | 11,005 | ||||||||
Other Segment [Member]
|
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Segment Reporting Information [Line Items] | |||||||||||
Revenues | 11,782 | 12,367 | 9,847 | ||||||||
Operating Income | 1,212 | (383) | (427) | ||||||||
Corporate Segment [Member]
|
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Segment Reporting Information [Line Items] | |||||||||||
Revenues | 4,322 | 4,409 | 3,589 | ||||||||
Operating Income | $ 1,091 | $ (583) | $ 1,796 |