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Employee Benefits (Details 6)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Benefits [Abstract]      
Discount rate 0.80% 0.70% 1.10%
Future salary increase 1.10% 1.10% 1.10%
Pension indexation 0.00% 0.00% 0.00%