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Other long term obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Other Liabilities Disclosure [Abstract]  
Schedule of other long term obligations
Other long term obligations are as follows:
 
 
December 31, 2014

 
December 31, 2013

Deferred lease inducements liability (note 16(b))
 
252

 
359

Asset retirement obligation (note 16(c))
 
562

 
512

Senior executive stock option plan (note 23(c))
 
22

 
940

Restricted share unit plan (note 23(d))
 
1,779

 
3,667

Directors' deferred stock unit plan (note 23(e))
 
2,005

 
3,662

Deferred gain on sale leaseback (note 16(d))
 
371

 
—

 
 
$
4,991

 
$
9,140

Less current portion of:
 
 
 
 
Senior executive stock option plan (note 23(c))
 
(22
)
 
—

Restricted share unit plan (note 23(d))
 
(1,009
)
 
(1,933
)
Directors' deferred share unit plan (note 23(f))
 
(408
)
 
—

Deferred gain on sale leaseback (note 16(d))
 
(93
)
 
—

 
 
$
3,459

 
$
7,207
Schedule of changes in deferred lease inducements
 
 
December 31, 2014

 
December 31, 2013

Balance, beginning of year
 
$
359

 
$
466

Amortization of deferred lease inducements
 
(107
)
 
(107
)
Balance, end of year
 
$
252

 
$
359
Schedule of changes in asset retirement obligation
The following table presents a continuity of the liability for the asset retirement obligation:
 
 
December 31, 2014

 
December 31, 2013

Balance, beginning of year
 
$
512

 
$
466

Accretion expense
 
50

 
46

Balance, end of year
 
$
562

 
$
512
Schedule of deferred lease inducement assets
The Company recorded a gain on the sale leaseback of certain heavy equipment. The gain on sale has been deferred and is being amortized over the term of the capital lease.
 
 
December 31, 2014

 
December 31, 2013

Balance, beginning of year
 
$
—

 
$
—

Addition
 
371

 
—

Balance, end of year
 
$
371

 
$
—