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Pensions - Components of net periodic pension benefit cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Components of net periodic pension benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost on projected benefit obligation 177 227 348 453
Expected return on assets (247) (294) (487) (589)
Net amortization and deferrals 193 161 381 323
Net periodic benefit cost $ 123 $ 94 $ 242 $ 187