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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Supplemental cash flow information    
Interest Paid $ 105,175 $ 99,047
Income taxes paid 10,242 17,675
Changes in accounts payable related to purchases of revenue earning equipment 21,975 83,937
Operating and revenue earning equipment acquired under capital leases 20,556 1,187
Noncash or Part Noncash Acquisition, Debt Assumed $ 379 $ 0
Euroway Ltd. [Member]
   
Supplemental cash flow information    
Acquisition related capital leases assumed 19900