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Pension Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Components of net periodic benefit cost        
Service cost $ 368 $ 400 $ 736 $ 800
Interest cost 344 325 688 650
Expected return on plan assets (563) (525) (1,126) (1,050)
Recognized net actuarial loss 314 300 628 600
Net periodic pension cost $ 463 $ 500 $ 926 $ 1,000