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Supplemental Cash Flow Information (Tables)
9 Months Ended
Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information

     Nine months ended
September 30,
 
     2015      2014  
     (in thousands)  

Cash paid for income taxes, net

   $ 3,341       $ 1,276   

Common stock repurchased for RSU tax withholdings

   $ 266       $ 211