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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net pension cost [Abstract]    
Amortization of prior service costs $ (32) $ (52)
Pension Plans [Member]
    
Net pension cost [Abstract]    
Service cost-benefits earned during period 27 31
Interest cost on projected benefit obligations 877 943
Expected return on plan assets (1,243) (1,118)
Amortization of prior service costs 52 52
Amortization of actuarial loss 428 490
Net pension costs 141 398
Supplemental Executive Retirement Plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Maximum amount of annual retirement benefits $ 125