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Employee Benefit Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Components of net pension cost        
Pension expense (actual) $ 330 $ 228 $ 990 $ 683
Actual [Member] | Pension plans, defined benefit [Member]
        
Components of net pension cost        
Service cost-benefits earned during the year       930
Interest costs on projected benefit obligations       604
Expected return on plan assets       (706)
Amortization of prior service cost       79
Amortization of unrecognized net loss       0
Net periodic pension expense       907
Estimated [Member] | Pension plans, defined benefit [Member]
        
Components of net pension cost        
Service cost-benefits earned during the year     1,202  
Interest costs on projected benefit obligations     667  
Expected return on plan assets     (721)  
Amortization of prior service cost     79  
Amortization of unrecognized net loss     93  
Net periodic pension expense     $ 1,320