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Pension Plans (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net pension cost [Abstract]        
Amortization of prior service costs $ (33,000) $ (33,000) $ (97,000) $ (97,000)
Amortization of actuarial loss (49,000) (255,000) (147,000) (787,000)
Pension Plans [Member]
        
Net pension cost [Abstract]        
Service cost-benefits earned during period 31,000 46,000 93,000 100,000
Interest cost on projected benefit obligations 954,000 899,000 2,862,000 2,653,000
Expected return on plan assets (1,214,000) (1,225,000) (3,642,000) (3,711,000)
Amortization of prior service costs 53,000 53,000 157,000 157,000
Amortization of actuarial loss 79,000 417,000 237,000 1,273,000
Net pension costs (97,000) 190,000 (293,000) 472,000
Supplemental Executive Retirement Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Maximum amount of annual retirement benefits     $ 125,000