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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Supplemental cash flow information
Interest Paid	$ 45,425	$ 37,325
Income taxes paid	3,721	4,183
Changes in accounts payable related to purchases of revenue earning equipment	29,381	316,457
Operating and revenue earning equipment acquired under capital leases	$ 458	$ 59

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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