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Pension Benefits (Tables)
9 Months Ended
Sep. 30, 2013
Pension Benefits [Abstract]  
Net Periodic Pension Cost
                 
    Three months ended September 30,   Nine months ended
September 30,
     2013   2012   2013   2012
Components of net periodic benefit cost
                                   
Service cost   $ 453     $ 373     $ 1,359     $ 1,119  
Interest cost     291       299       873       897  
Expected return on plan assets     (440 )      (406 )      (1,320 )      (1,218 ) 
Amortization of prior year service cost     (5 )      (5 )      (15 )      (15 ) 
Amortization of transition asset     (2 )      (4 )      (6 )      (12 ) 
Recognized net actuarial loss     341       262       1,023       786  
Net periodic pension cost   $ 638     $ 519     $ 1,914     $ 1,557