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Pension Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Components of net periodic benefit cost        
Service cost $ 368 $ 400 $ 1,104 $ 1,200
Interest cost 344 325 1,032 975
Expected return on plan assets (563) (525) (1,689) (1,575)
Recognized net actuarial loss 314 300 942 900
Net periodic pension cost $ 463 $ 500 $ 1,389 $ 1,500