XML 65 R28.htm IDEA: XBRL DOCUMENT v3.19.1
Supplementary cash flow information
 12 Months Ended
Dec. 31, 2018
Supplemental Statement of Cash Flow [Abstract]  
Supplementary cash flow information
22. Supplementary cash flow information
 
December 31, 2018

 
December 31, 2017

Changes in non-cash working capital
 
 
 
Accounts receivable and other
$
(1,471
)
 
$
(2,456
)
Inventories
20,775

 
(31,437
)
Accounts payable and accrued liabilities
(14,242
)
 
(1,862
)
Total
$
5,062

 
$
(35,755
)
Supplementary cash flow information
 
 
 
Income taxes paid
$
36,879

 
$
42,293

Interest paid
$
36,750

 
$
36,750