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General Information (Details 1)
Dec. 31, 2017
Number
Number of employees 8,270
Senior Executives [Member]  
Number of employees 16
Managers and Deputy Managers [Member]  
Number of employees 396
Other workers [Member]  
Number of employees 7,858
Parent [Member]  
Number of employees 363
Parent [Member] | Senior Executives [Member]  
Number of employees 10
Parent [Member] | Managers and Deputy Managers [Member]  
Number of employees 74
Parent [Member] | Other workers [Member]  
Number of employees 279