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Other long term obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]  
Schedule of other long term obligations
Other long term obligations are as follows:
 
 
December 31, 2018

 
December 31, 2017

Deferred lease inducements liability (note 17(b))
 
$
1,419

 
$
10

Asset retirement obligation (note 17(c))
 
818

 
744

Directors' deferred stock unit plan (note 22(e))
 
13,413

 
5,672

Deferred gain on sale-leaseback (note 17(d))
 
8,438

 
7,654

Provision for loss on sublease (note 17(e))
 
1,535

 
—

 
 
$
25,623

 
$
14,080
Schedule of changes in deferred lease inducements
 
 
December 31, 2018

 
December 31, 2017

Balance, beginning of year
 
$
10

 
$
38

Addition
 
1,412

 
—

Amortization of deferred lease inducements
 
(3
)
 
(28
)
Balance, end of year
 
$
1,419

 
$
10
Schedule of changes in asset retirement obligation
The following table presents a continuity of the liability for the asset retirement obligation:
 
 
December 31, 2018

 
December 31, 2017

Balance, beginning of year
 
$
744

 
$
678

Accretion expense
 
74

 
66

Balance, end of year
 
$
818

 
$
744
Schedule of deferred gain on sale-leaseback
 
 
December 31, 2018

 
December 31, 2017

Balance, beginning of year
 
$
7,654

 
$
3,199

Addition
 
2,262

 
5,155

Amortization of deferred gain on sale-leaseback
 
(1,478
)
 
(700
)
Balance, end of year
 
$
8,438

 
$
7,654