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Long-term Debt Non-Interest Bearing Loan (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 ($)	Dec. 01, 2010 FreightLink [Member] AUD	Dec. 31, 2012 FreightLink [Member] Non interest bearing note [Member] USD ($)	Dec. 31, 2012 FreightLink [Member] Non interest bearing note [Member] AUD	Dec. 01, 2010 FreightLink [Member] Non interest bearing note [Member] USD ($)	Dec. 01, 2010 FreightLink [Member] Non interest bearing note [Member] AUD
Debt Instrument [Line Items]
Long-term debt assumed			$ 1,741	1,806	$ 2,200		$ 1,700	1,800
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
Debt Instrument, Interest Rate, Effective Percentage					8.00%	8.00%

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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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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