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Employee Benefit Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Components of net pension cost    
Pension expense - three months ended March 31, (actual) $ 286 $ 330
Estimated [member] | Pension plans, defined benefit [Member]
    
Components of net pension cost    
Service cost-benefits earned during the year 1,211  
Interest costs on projected benefit obligations 645  
Expected return on plan assets (820)  
Expected administrative expenses 0  
Amortization of prior service cost 78  
Amortization of unrecognized net loss 30  
Net periodic pension expense 1,144  
Pension expense - three months ended March 31, (actual) 286  
Actual [Member] | Pension plans, defined benefit [Member]
    
Components of net pension cost    
Service cost-benefits earned during the year   1,168
Interest costs on projected benefit obligations   668
Expected return on plan assets   (776)
Expected administrative expenses   40
Amortization of prior service cost   78
Amortization of unrecognized net loss   46
Net periodic pension expense   1,224
Pension expense - three months ended March 31, (actual)   $ 330