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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2013
Supplemental Cash Flow Information  
Schedule of supplemental cash flow information

Supplemental cash flow information for the years ended December 31, 2011, 2012 and 2013 is as follows (in thousands):

 
   2011   2012   2013  

Income taxes paid, net of refunds

   $ 50,324   $ 57,663   $ 65,511  
               
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Interest paid

   $ 1,521   $ 1,594   $ 2,264  
               
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Assets acquired through capital leases

   $ —   $ —   $ 29,739  
               
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