Quarterly report pursuant to Section 13 or 15(d)

Description of business and summary of significant accounting policies - Property, Plant and Equipment (Details)

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Description of business and summary of significant accounting policies - Property, Plant and Equipment (Details)
6 Months Ended
Jun. 30, 2014
Minimum
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful lives 3 years
Maximum
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful lives 15 years