The amount of acquisition cost of a business combination allocated to the noncurrent portion of the long-term debt assumed from the acquired entity.

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Long-term Debt (Details 5) In Thousands, unless otherwise specified	12 Months Ended		12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 FreightLink [Member] USD ($)	Dec. 01, 2010 FreightLink [Member] USD ($)	Dec. 01, 2010 FreightLink [Member] AUD
Debt Instrument [Line Items]
2012	$ 57,168	$ 103,690
2013	32,113
2014	32,121
2015	136,598
2016	366,650
Thereafter	51,486
Total long-term debt	676,136		51,000	48,200	50,000
Debt instrument, maturity date	Jul. 29, 2016		Jan. 14, 2054
Long-term debt assumed			$ 2,000	$ 1,741	1,806