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Supplemental Cash Flow Information (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Supplemental cash flow information
Interest Paid	$ 61,502	$ 63,888
Income taxes (refunded) paid	7,302	(9,061)
Changes in accounts payable related to purchases of revenue earning equipment	62,871	86,021
Assets acquired under capital leases	$ 1,153	$ 99

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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