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Pension benefits (Details 3) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Current accrued benefit cost | $ 320 | $ 249
Non-current accrued benefit cost | 2,271 | 2,586
Net amount recognized | $ 2,591 | $ 2,835

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