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Assets held for sale (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Disclosure of assets held for sale
The balance of assets held for sale is comprised as follows:
 
 
December 31, 2015

 
December 31, 2014

Contract-specific equipment sold to long-term customer
 
$

 
$
29,400

Equipment
 
180

 
189

 
 
$
180

 
$
29,589