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Pension Benefits (Tables)
3 Months Ended
Mar. 31, 2014
Pension Benefits [Abstract]  
Net Periodic Pension Cost
         
    Three months ended March 31,
     2014   2013
Components of net periodic benefit cost
                 
Service cost   $ 430     $ 453  
Interest cost     331       291  
Expected return on plan assets     (498 )      (440 ) 
Amortization of prior year service cost     (5 )      (5 ) 
Amortization of transition asset     -       (2 ) 
Recognized net actuarial loss     272       341  
Net periodic pension cost   $ 530     $ 638