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Supplemental Cash flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Cash Flow Statement [Abstract]  
Changes in non-cash working capital
Changes in non-cash working capital consisted of the following:
(000s)
 
2017

 
2016

Operating Activities
 
 
 
 
(Increase) decrease in current assets
 
 
 
 
Accounts receivable
 
$
(3,254
)
 
$
8,093

Prepaids and other
 
(3,044
)
 
1,159

Product inventory1
 
5,789

 
(3,242
)
Increase (decrease) in current liabilities
 

 

Accounts payable and accrued liabilities
 
4,367

 
1,286

 
 
$
3,858

 
$
7,296

1   The change in non-cash working capital associated with product inventory represents the change in operating costs capitalized as product inventory in the respective periods.

(000s)
 
2017

 
2016

Investing Activities
 
 
 
 
Increase (decrease) in current liabilities
 

 

Accounts payable and accrued liabilities
 
(1,587
)
 
5,556

 
 
$
(1,587
)
 
$
5,556