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Employee Benefit Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Components of net pension cost        
Pension expense $ 236 $ 286 $ 472 $ 572
Pension
        
Components of net pension cost        
Service cost - benefits earned during the year       1,174
Interest costs on projected benefit obligations       646
Expected return on plan assets       (797)
Expected administrative expenses       40
Amortization of prior service cost       79
Amortization of unrecognized net loss       31
Net periodic pension expense       1,173
Pension expense 236 286 472 572
Pension | Estimated
        
Components of net pension cost        
Service cost - benefits earned during the year     981  
Interest costs on projected benefit obligations     732  
Expected return on plan assets     (887)  
Expected administrative expenses     40  
Amortization of prior service cost     79  
Amortization of unrecognized net loss     0  
Net periodic pension expense     $ 945