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Pension Benefits (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Components of net periodic benefit cost        
Service cost $ 370 $ 390 $ 1,110 $ 1,170
Interest cost 318 326 954 978
Expected return on plan assets (699) (631) (2,097) (1,893)
Special termination benefit liability 16 0 48 0
Recognized net actuarial loss 387 367 1,161 1,101
Net periodic pension cost $ 392 $ 452 $ 1,176 $ 1,356