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Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Service cost $ 32 $ 29 $ 94 $ 88
Interest cost 368 418 1,134 1,256
Expected return on plan assets (177) (702) (836) (2,107)
Amortization of net (gain)/loss (87) 53 16 158
Net periodic pension cost (income) 136 (202) 408 (605)
Pension Plan [Member]        
Service cost
Interest cost 328 361 984 1,086
Expected return on plan assets (177) (702) (836) (2,107)
Amortization of net (gain)/loss (93) 61 26 183
Net periodic pension cost (income) 58 (280) 174 (838)
SERP [Member]        
Service cost 32 29 94 88
Interest cost 40 57 150 170
Expected return on plan assets
Amortization of net (gain)/loss 6 (8) (10) (25)
Net periodic pension cost (income) $ 78 $ 78 $ 234 $ 233