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Supplemental cash flow information (Tables)
3 Months Ended
Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]  
Supplemental cash flow information
 
Three months ended March 31,
 
2016
2015
Cash paid for:
 
 
Interest
$
160

$
5

Income taxes
2,596

1,142

Non-cash investing activities:
 
 
Accrued capital costs
$
206

$
1,202