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Pensions - Defined benefit obligation (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan As Recognized In The Statement Of Financial Position [Abstract]      
Present value of the defined benefit obligation $ 1,481 $ 1,128 $ 949
Fair value of plan assets 1,266 963 801
Net pension obligation 215 165 148
Remeasurement loss 211 60 48
Net balance sheet recorded pension liability December 31 $ 425 $ 225 $ 196