Supplemental Cash Flow Information (Details) (USD $)	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012
Supplemental cash flow information
Interest Paid	$ 109,669,000	$ 105,175,000
Income taxes paid	8,900,000	10,242,000
Changes in accounts payable related to purchases of revenue earning equipment	1,670,000	21,975,000
Operating and revenue earning equipment acquired under capital leases	5,500,000	20,556,000
Fair value of debt assumed on acquisition	0
Euroway Ltd. [Member]
Supplemental cash flow information
Fair value of debt assumed on acquisition		379,000
Noncash or Part Noncash Acquisition, Other Liabilities 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 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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