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Other long term obligations (Tables)
 12 Months Ended
Dec. 31, 2013
Other Liabilities Disclosure [Abstract]  
Schedule of other long term obligations
Other long term obligations are as follows:
 
 
December 31, 2013

 
December 31, 2012

Liabilities related to equipment leases
 
$
—

 
$
209

Deferred lease inducements (note 17(b))
 
359

 
466

Asset retirement obligation (note 17(c))
 
512

 
466

Senior executive stock option plan (note 23(c))
 
940

 
591

Restricted share unit plan (note 23(d))
 
3,667

 
1,742

Directors' deferred stock unit plan (note 23(e))
 
3,662

 
2,070

 
 
$
9,140

 
$
5,544

Less current portion of:
 
 
 
 
Restricted share unit plan (note 23(d))
 
(1,933
)
 
(503
)
Directors' deferred share unit plan (note 23(e))
 
—

 
(253
)
 
 
$
7,207

 
$
4,788
Schedule of changes in deferred lease inducements
 
 
December 31, 2013

 
December 31, 2012

Balance, beginning of year
 
$
466

 
$
574

Amortization of deferred lease inducements
 
(107
)
 
(108
)
Balance, end of year
 
$
359

 
$
466
Schedule of changes in asset retirement obligation
The following table presents a continuity of the liability for the asset retirement obligation:
 
 
December 31, 2013

 
December 31, 2012

Balance, beginning of year
 
$
466

 
$
424

Accretion expense
 
46

 
42

Balance, end of year
 
$
512

 
$
466