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Pension Plans (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net pension cost [Abstract]        
Amortization of prior service costs $ (32,000) $ (52,000) $ (64,000) $ (104,000)
Pension Plans [Member]
        
Net pension cost [Abstract]        
Service cost-benefits earned during period 27,000 31,000 54,000 62,000
Interest cost on projected benefit obligations 877,000 943,000 1,754,000 1,886,000
Expected return on plan assets (1,243,000) (1,118,000) (2,486,000) (2,236,000)
Amortization of prior service costs 52,000 52,000 104,000 104,000
Amortization of actuarial loss 428,000 490,000 856,000 980,000
Net pension costs 141,000 398,000 282,000 796,000
Supplemental Executive Retirement Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Maximum amount of annual retirement benefits     $ 125,000