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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, 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] |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 320,933 | 291,109 | 250,983
Operating Income |  |  |  |  |  |  |  |  | 15,999 | 17,036 | 11,005
Other Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 11,782 | 12,367 | 9,847
Operating Income |  |  |  |  |  |  |  |  | 1,212 | (383) | (427)
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,322 | 4,409 | 3,589
Operating Income |  |  |  |  |  |  |  |  | $ 1,091 | $ (583) | $ 1,796

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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