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Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Service cost $ 27 $ 27
Interest cost 435 435
Expected return on plan assets (675) (675)
Amortization of transition obligation
Amortization of net (gain)/loss 51 51
Amortization of prior service cost
Net periodic pension (income)/cost (162) (162)
Pension Plan [Member]    
Service cost
Interest cost 375 376
Expected return on plan assets (675) (675)
Amortization of transition obligation
Amortization of net (gain)/loss 60 60
Amortization of prior service cost
Net periodic pension (income)/cost (240) (239)
SERP [Member]    
Service cost 27 27
Interest cost 60 59
Expected return on plan assets
Amortization of transition obligation
Amortization of net (gain)/loss (9) (9)
Amortization of prior service cost
Net periodic pension (income)/cost $ 78 $ 77