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Risks and Uncertainties (Details) - Foreign currency exchange risk - $ / €
6 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Apr. 30, 2014
Euro          
Risks and uncertainties          
Foreign currency exchange rate, spot   1.11     1.39
Foreign currency exchange rate, average   1.11 1.37    
Net sales          
Risks and uncertainties          
Concentration risk (as a percentage of benchmark)       50.00%  
Total assets          
Risks and uncertainties          
Concentration risk (as a percentage of benchmark) 50.00%