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 Schedule of Future Payments Including Capital Leases (Details) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 01, 2010 FreightLink [Member] USD ($)	Dec. 01, 2010 FreightLink [Member] AUD	Dec. 31, 2012 Non interest bearing note [Member] FreightLink [Member] USD ($)	Dec. 31, 2012 Non interest bearing note [Member] FreightLink [Member] AUD	Dec. 01, 2010 Non interest bearing note [Member] FreightLink [Member] USD ($)	Dec. 01, 2010 Non interest bearing note [Member] FreightLink [Member] AUD
Debt Instrument [Line Items]
2013	$ 87,569	$ 57,168
2014	93,984
2015	117,727
2016	126,927
2017	1,431,370
Thereafter	52,483
Total long-term debt	1,910,060
Long-term debt	1,858,135	626,194	48,200			52,000	48,200	50,000
Debt instrument, maturity date	Jul. 29, 2016				Jan. 14, 2054	Jan. 14, 2054
Long-term debt assumed			$ 1,741	1,806	$ 2,200		$ 1,700	1,800