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Other long term obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Other Liabilities Disclosure [Abstract]  
Schedule of other long term obligations
 
Note
 
December 31, 2019

 
December 31, 2018

Directors' deferred stock unit plan
18(c)
 
$
14,375

 
$
13,413

Deferred gain on sale-leaseback
14(a)
 
6,593

 
8,438

Other
 
 
3,536

 
2,353

Deferred lease inducements liability
 
 
—

 
1,419

 
 
 
$
24,504

 
$
25,623
Schedule of deferred gain on sale-leaseback
 
 
December 31, 2019

 
December 31, 2018

Balance, beginning of year
 
$
8,438

 
$
7,654

Addition
 
—

 
2,262

Amortization of deferred gain on sale-leaseback
 
(1,845
)
 
(1,478
)
Balance, end of year
 
$
6,593

 
$
8,438