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Other assets (Tables)
 12 Months Ended
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of other assets
Other assets are as follows:
 
 
December 31, 2013

 
December 31, 2012

Prepaid lease payments (note 8)
 
$
1,274

 
$
97

Intangible assets (note 12(b))
 
7,043

 
12,063

Deferred financing costs (note 12(c))
 
3,813

 
5,350

 
 
$
12,130

 
$
17,510
Schedule of intangible assets
Intangible assets
December 31, 2013
 
Cost

 
Accumulated
Amortization

 
Net Book Value

Other intangible assets
 
$
350

 
$
350

 
$
—

Internal-use software
 
22,713

 
15,670

 
7,043

 
 
$
23,063

 
$
16,020

 
$
7,043

December 31, 2012
 
Cost

 
Accumulated
Amortization

 
Net Book Value

Customer relationships and backlog
 
$
4,442

 
$
1,960

 
$
2,482

Other intangible assets
 
2,364

 
1,523

 
841

Internal-use software
 
19,887

 
12,425

 
7,462

Patents
 
2,017

 
739

 
1,278

 
 
$
28,710

 
$
16,647

 
$
12,063
Schedule of estimated amortization expense for future years
The estimated amortization expense for future years is as follows:
For the year ending December 31,
 
 
2014
 
$
3,003

2015
 
2,198

2016
 
1,255

2017
 
587

 
 
$
7,043
Schedule of deferred finance costs
Deferred financing costs
December 31, 2013
 
Cost

 
Accumulated
Amortization

 
Net Book Value

Revolving Facilities
 
$
6,881

 
$
5,994

 
$
887

Series 1 Debentures
 
8,655

 
5,729

 
2,926

 
 
$
15,536

 
$
11,723

 
$
3,813

December 31, 2012
 
Cost

 
Accumulated
Amortization

 
Net Book Value

Term and Revolving Facilities
 
$
5,861

 
$
5,233

 
$
628

Series 1 Debentures
 
6,886

 
2,164

 
4,722

 
 
$
12,747

 
$
7,397

 
$
5,350