Goodwill And Intangible Assets (Schedule Of Changes In Gross Carrying Amounts Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended	12 Months Ended			3 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011	Sep. 30, 2010 Logistics [Member]	Dec. 31, 2010 Logistics [Member]	Dec. 31, 2009 Logistics [Member]	Dec. 31, 2011 Logistics [Member]	Mar. 31, 2009 Truckload [Member]	Dec. 31, 2011 Truckload [Member]	Dec. 31, 2010 Truckload [Member]	Dec. 31, 2009 Truckload [Member]	Dec. 31, 2011 Other [Member]	Dec. 31, 2010 Other [Member]	Dec. 31, 2009 Other [Member]
Goodwill [Line Items]
Goodwill	$ 520,699	$ 520,293	$ 520,765		$ 55,374	$ 54,968	$ 55,440		$ 464,598	$ 464,598	$ 464,598	$ 727	$ 727	$ 727
Accumulated impairment losses	(183,049)	(166,635)	(183,049)		(48,236)	(31,822)	(48,236)		(134,813)	(134,813)	(134,813)
Total Goodwill	337,650	353,658	337,716	0	7,138	23,146	7,204		329,785	329,785	329,785	727	727	727
Impairment charge		(16,414)		(16,400)		(16,414)		(134,800)
Change in foreign currency exchange rates	$ 66	$ 406			$ 66	$ 406