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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Other Significant Noncash Transactions [Line Items]    
Payments to Acquire Businesses, Net of Cash Acquired $ 1,649 $ 1,420
Supplemental cash flow information    
Interest Paid 68,974 67,545
Income taxes paid 7,332 8,447
Changes in accounts payable related to purchases of revenue earning equipment 1,520 40,389
Operating and revenue earning equipment acquired under capital leases 2,371 4,814
Other Acquisitions Completed in Prior Years [Member]
   
Other Significant Noncash Transactions [Line Items]    
Payments to Acquire Businesses, Net of Cash Acquired $ 1,649 $ 1,420