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Segment Information (Disclosure Of Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Revenues	$ 507,937	$ 509,587	$ 515,897	$ 469,429	$ 463,214	$ 463,262	$ 463,469	$ 425,075	$ 2,002,850	$ 1,815,020	$ 1,666,470
Operating Income	49,399	50,066	46,767	27,442	40,627	40,145	35,546	18,264	173,674	134,582	96,691
Truckload Transportation Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues									1,694,965	1,550,601	1,437,527
Operating Income									157,604	122,208	84,524
Value Added Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues									291,109	250,983	217,942
Operating Income									17,036	11,005	12,350
Other Segment [Member]
Segment Reporting Information [Line Items]
Revenues									12,367	9,847	7,995
Operating Income									(383)	(427)	(913)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Revenues									4,409	3,589	3,006
Operating Income									$ (583)	$ 1,796	$ 730

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1



Reference 2: 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

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