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Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Service cost $ 27 $ 36 $ 80 $ 164
Interest cost 435 393 1,305 1,177
Expected return on plan assets (675) (713) (2,025) (2,133)
Amortization of transition obligation
Amortization of net (gain)/loss 50 (16) 152 (63)
Amortization of prior service cost
Net periodic pension (income)/cost (163) (300) (488) (855)
Pension Plan [Member]        
Service cost
Interest cost 375 341 1,127 1,023
Expected return on plan assets (675) (713) (2,025) (2,133)
Amortization of transition obligation
Amortization of net (gain)/loss 59 179
Amortization of prior service cost
Net periodic pension (income)/cost (241) (372) (719) (1,110)
SERP [Member]        
Service cost 27 36 80 164
Interest cost 60 52 178 154
Expected return on plan assets
Amortization of transition obligation
Amortization of net (gain)/loss (9) (16) (27) (63)
Amortization of prior service cost
Net periodic pension (income)/cost $ 78 $ 72 $ 231 $ 255