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Pension Benefits (Details) - Pension Plans, Defined Benefit [Member] - 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 benefit cost        
Service cost $ 390 $ 368 $ 780 $ 736
Interest cost 326 344 652 688
Expected return on plan assets (631) (563) (1,262) (1,126)
Recognized net actuarial loss 367 314 734 628
Net periodic pension cost $ 452 $ 463 $ 904 $ 926