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Pension Plans (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net pension cost [Abstract]        
Amortization of prior service costs $ (33,000) $ (53,000) $ (97,000) $ (157,000)
Pension Plans [Member]
        
Net pension cost [Abstract]        
Service cost-benefits earned during period 46,000 11,000 100,000 73,000
Interest cost on projected benefit obligations 899,000 940,000 2,653,000 2,826,000
Expected return on plan assets (1,225,000) (1,119,000) (3,711,000) (3,355,000)
Amortization of prior service costs 53,000 53,000 157,000 157,000
Amortization of actuarial loss 417,000 425,000 1,273,000 1,405,000
Net pension costs 190,000 310,000 472,000 1,106,000
Supplemental Executive Retirement Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Maximum amount of annual retirement benefits     $ 125,000