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Supplemental Cash Flow Information (Tables)
9 Months Ended
Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
     Nine months ended
September 30,
 
     2018      2017  
     (in thousands)  

Cash paid for income taxes, net

   $ 5,086      $ 2,953  

Common stock repurchased for RSU tax witholdings

   $ 678      $ 778