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Supplemental Cash Flow Information (Tables)
9 Months Ended
Sep. 30, 2013
Supplemental Cash Flow Information  
Summary Of Supplemental Cash Flow Information
      Nine Months Ended September 30,
      2013 2012
           
Cash paid during the period for:      
 Interest  $ 21,601 $ 13,204
 Income taxes, net of refunds    7,444   16,778
           
Non-cash investing and financing activities:      
 Increase in accounts payable associated with acquisition of property and equipment   539   958
 Capital lease obligations    120   168