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Pension Benefits (Tables)
6 Months Ended
Jun. 30, 2013
Pension Benefits [Abstract]  
Net Periodic Pension Cost
 
    Three months ended June 30,   Six months ended
June 30,
     2013   2012   2013   2012
Components of net periodic benefit cost
                                   
Service cost   $ 453     $ 373     $ 906     $ 746  
Interest cost     291       299       582       598  
Expected return on plan assets     (440 )      (406 )      (880 )      (812 ) 
Amortization of prior year service cost     (5 )      (5 )      (10 )      (10 ) 
Amortization of transition asset     (2 )      (4 )      (4 )      (8 ) 
Recognized net actuarial loss     341       262       682       524  
Net periodic pension cost   $ 638     $ 519     $ 1,276     $ 1,038