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Equity affiliates, other investments and related parties - Compensation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
employee
Dec. 31, 2015
USD ($)
employee
Related party transactions [abstract]      
Number of people | employee 98,277 102,168 96,019
Direct or indirect compensation $ 15,600 $ 13,400 $ 12,800
Pension expense 10,800 6,100 3,900
Share-based payments expense 6,500 5,300 3,500
Severance provision 119,700 104,700 96,700
Directors' fees $ 1,440 $ 1,220 $ 1,340
Executive officers and members of the Board of Directors      
Related party transactions [abstract]      
Number of people | employee 15 14 14
Directors of corporate functions in Group Performance Management Committee      
Related party transactions [abstract]      
Number of people | employee 4 4 4