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General Information (Details)
Dec. 31, 2019
Number
Statement [Line Items]  
Number of employees 8,961
Senior Executives [Member]  
Statement [Line Items]  
Number of employees 14
Managers and Deputy Managers [Member]  
Statement [Line Items]  
Number of employees 439
Other workers [Member]  
Statement [Line Items]  
Number of employees 8,508
Parent [Member]  
Statement [Line Items]  
Number of employees 405
Parent [Member] | Senior Executives [Member]  
Statement [Line Items]  
Number of employees 10
Parent [Member] | Managers and Deputy Managers [Member]  
Statement [Line Items]  
Number of employees 89
Parent [Member] | Other workers [Member]  
Statement [Line Items]  
Number of employees 306