Goodwill And Intangible Assets (Schedule Of Changes In Gross Carrying Amounts Of Goodwill) (Details) (USD $) In Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill	$ 521,122	$ 520,699	$ 520,293
Accumulated impairment losses	(183,049)	(183,049)	(166,635)
Total Goodwill	338,073	337,650	353,658
Impairment charge		(16,414)
Change in foreign currency exchange rates	423	406
Logistics [Member]
Goodwill	55,797	55,374	54,968
Accumulated impairment losses	(48,236)	(48,236)	(31,822)
Total Goodwill	7,561	7,138	23,146
Impairment charge		(16,414)
Change in foreign currency exchange rates	423	406
Truckload [Member]
Goodwill	464,598	464,598	464,598
Accumulated impairment losses	(134,813)	(134,813)	(134,813)
Total Goodwill	329,785	329,785	329,785
Impairment charge
Change in foreign currency exchange rates
Other [Member]
Goodwill	727	727	727
Accumulated impairment losses
Total Goodwill	727	727	727
Impairment charge
Change in foreign currency exchange rates

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details