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Pension Plans (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Service cost $ 27,000 $ 79,000
Interest cost 435,000 393,000
Expected return on plan assets $ (675,000) $ (708,000)
Amortization of transition obligation
Amortization of net (gain)/loss $ 51,000 $ (31,000)
Amortization of prior service cost
Net periodic pension (income)/cost $ (162,000) $ (267,000)
Pension Plan [Member]    
Service cost
Interest cost $ 376,000 $ 341,000
Expected return on plan assets $ (675,000) $ (708,000)
Amortization of transition obligation
Amortization of net (gain)/loss $ 60,000
Amortization of prior service cost
Net periodic pension (income)/cost $ (239,000) $ (367,000)
SERP [Member]    
Service cost 27,000 79,000
Interest cost $ 59,000 $ 52,000
Expected return on plan assets
Amortization of transition obligation
Amortization of net (gain)/loss $ (9,000) $ (31,000)
Amortization of prior service cost
Net periodic pension (income)/cost $ 77,000 $ 100,000