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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Supplemental cash flow information
Interest Paid	$ 64,060	$ 61,502
Income taxes paid	6,644	7,302
Changes in accounts payable related to purchases of revenue earning equipment	112,991	62,871
Operating and revenue earning equipment acquired under capital leases	$ 616	$ 1,153

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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