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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Supplemental cash flow information
Interest Paid	$ 67,545	$ 64,060
Income taxes paid	8,447	6,644
Changes in accounts payable related to purchases of revenue earning equipment	40,389	112,990
Operating and revenue earning equipment acquired under capital leases	$ 4,814	$ 616

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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