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Personnel Expenses (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Details of personnel expenses by function:      
Cost of sales € 988,689 € 810,512 € 731,192
Research and development 106,472 93,817 90,495
Selling, general & administration expenses 382,472 345,224 323,880
Total personnel expenses 1,477,633 1,249,553 1,145,567
Details by nature:      
Wages and salaries 1,178,527 1,000,682 917,810
Contributions to pension plans (see note 29) 29,941 21,363 20,347
Other social charges 28,785 29,055 27,679
Social Security 240,380 198,453 179,731
Total personnel expenses € 1,477,633 € 1,249,553 € 1,145,567