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Supplemental cash flow information
9 Months Ended
Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]  
Supplemental cash flow information
Supplemental cash flow information
 
Nine months ended September 30,
 
2016
2015
Cash paid for:
 
 
Interest
$
9,893

$
9,396

Income taxes
10,245

13,921