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Pension Benefits - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Components of net periodic benefit cost        
Service cost $ 441 $ 374 $ 882 $ 748
Interest cost 319 402 638 804
Expected return on plan assets (817) (762) (1,634) (1,524)
Recognized net actuarial loss 648 366 1,296 732
Net periodic pension cost $ 591 $ 380 $ 1,182 $ 760