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Significant accounting policies - Property, Plant and Equipment (Details)
12 Months Ended
Dec. 31, 2013
Other equipment | Minimum
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 5 years
Other equipment | Maximum
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 10 years
Licensed motor vehicles | Minimum
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 5 years
Licensed motor vehicles | Maximum
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 10 years
Office and computer equipment
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 4 years
Buildings
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 10 years