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Long-term Debt (Details 4) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2011 FreightLink [Member] USD ($)	Dec. 01, 2010 FreightLink [Member] USD ($)	Dec. 01, 2010 FreightLink [Member] AUD
Debt Instrument [Line Items]
Long-term debt assumed		$ 2,000	$ 1,741	1,806
Long-term debt	$ 676,136	$ 51,000	$ 48,200	50,000
Debt instrument, maturity date	Jul. 29, 2016	Jan. 14, 2054
Debt Instrument, Interest Rate, Effective Percentage		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

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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