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Supplemental cash flow information (Tables)
 6 Months Ended
Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental cash flow information
 
Six months ended June 30,
 
2017
 
2016
Cash paid for:
 
 
 
Interest
$
9,903

 
$
9,701

Income taxes, net
1,796

 
6,316