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Pension Benefits (Details) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Components of net periodic benefit cost        
Service cost $ 390 $ 368 $ 1,170 $ 1,104
Interest cost 326 344 978 1,032
Expected return on plan assets (631) (563) (1,893) (1,689)
Recognized net actuarial loss 367 314 1,101 942
Net periodic pension cost $ 452 $ 463 $ 1,356 $ 1,389