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Accounts receivable
12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Accounts receivable
Accounts receivable
 
 
December 31, 2013

 
December 31, 2012

Accounts receivable – trade
 
$
59,309

 
$
118,509

Accounts receivable – holdbacks
 
9,055

 
33,352

Income and other taxes receivable
 
12

 
420

Accounts receivable – other
 
1,801

 
714

Allowance for doubtful accounts (note 16(d))
 

 
(185
)
 
 
$
70,177

 
$
152,810


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. As of December 31, 2013 there were $nil holdback balances (December 31, 2012$2,597) which relate to contracts whereby the normal operating cycle is greater than one year and therefore are not expected to be collected within one year.