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General Information (Details)
Dec. 31, 2018
Number
Number of employees 8,797
Senior Executives [Member]  
Number of employees 14
Managers and Deputy Managers [Member]  
Number of employees 420
Other workers [Member]  
Number of employees 8,363
Parent [Member]  
Number of employees 372
Parent [Member] | Senior Executives [Member]  
Number of employees 10
Parent [Member] | Managers and Deputy Managers [Member]  
Number of employees 79
Parent [Member] | Other workers [Member]  
Number of employees 283