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Provisions and other long-term liabilities (Details Textual) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Provisions and other long-term liabilities [Line Items]    
Payments in respect of controversaries settlements $ 3,389,000  
Provision for fiscal controversies [Member]    
Disclosure Of Provisions and other long-term liabilities [Line Items]    
Other provisions   $ 5,636,000