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Accounts receivable
12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Accounts receivable
Accounts receivable
 
 
December 31, 2014

 
December 31, 2013

Accounts receivable – trade
 
$
54,733

 
$
59,309

Accounts receivable – holdbacks
 
10,741

 
9,055

Accounts receivable – other
 
1,029

 
1,813

Allowance for doubtful accounts (note 15(d))
 

 

 
 
$
66,503

 
$
70,177


Accounts receivable – holdbacks represent amounts up to 10% of the contract value under certain contracts that the customer is contractually entitled to withhold until completion of the project or until certain project milestones are achieved.