Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental cash flow information
Interest Paid	$ 126,764,000	$ 126,916,000	$ 120,184,000
Income taxes paid (refunded)	11,613,000	21,541,000	4,906,000
Changes in accounts payable related to purchases of revenue earning equipment	27,528,000	61,290,000	17,559,000
Operating and revenue earning equipment acquired under capital leases	20,670,000	39,279,000	137,000
Fair value of debt assumed on acquisition	379,000	0	0
Capital leases assumed	$ 19,900,000

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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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The amount of liabilities that an entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition that are not presented as a separate disclosure or otherwise listed in the existing taxonomy. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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