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Costs incurred and estimated earnings net of billings on uncompleted contracts
 12 Months Ended
Dec. 31, 2013
Contractors [Abstract]  
Costs incurred and estimated earnings net of billings on uncompleted contracts
Costs incurred and estimated earnings net of billings on uncompleted contracts
 
 
December 31, 2013

 
December 31, 2012

Costs incurred and estimated earnings on uncompleted contracts
 
$
533,837

 
$
404,323

Less billings to date
 
(508,026
)
 
(367,378
)
 
 
$
25,811

 
$
36,945


Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
 
 
December 31, 2013

 
December 31, 2012

Unbilled revenue
 
$
32,168

 
$
80,223

Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
(6,357
)
 
(9,755
)
 
 
$
25,811

 
$
70,468


 
Unbilled revenue related to discontinued operations amounted to $nil (December 31, 2012– $33,523).
An amount of $14,381 (December 31, 2012 – $16,733) is recognized within unbilled revenue relating to a single long-term customer contract, whereby the normal operating cycle for this project is greater than one year. As described in note 2(b) the estimated balances within unbilled revenue are subject to uncertainty concerning ultimate realization.