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Supplemental Cash flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Cash Flow Statement [Abstract]  
Changes in non-cash working capital
Changes in non-cash working capital consisted of the following:
($000s)
 
2018

 
2017

Operating Activities
 
 
 
 
(Increase) decrease in current assets
 
 
 
 
Accounts receivable
 
$
6,076

 
$
(3,254
)
Prepaids and other
 
97

 
(3,044
)
Product inventory1
 
905

 
5,789

Increase (decrease) in current liabilities
 
 
 
 
Accounts payable and accrued liabilities
 
(1,975
)
 
4,367

Other long-term liabilities
 
807

 
—

 
 
$
5,910

 
$
3,858

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)
 
2018

 
2017

Investing Activities
 
 
 
 
(Increase) decrease in current assets
 
 
 
 
Prepaids and other
 
$
(4
)
 
$
—

Increase (decrease) in current liabilities
 
 
 
 
Accounts payable and accrued liabilities
 
255

 
(1,587
)
 
 
$
251

 
$
(1,587
)

($000s)
 
2018

 
2017

Financing Activities
 
 
 
 
Increase (decrease) in current liabilities
 
 
 
 
Accounts payable and accrued liabilities
 
$
(3
)
 
$
—

 
 
$
(3
)
 
$
—