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Pension (Tables)
9 Months Ended
Sep. 30, 2015
Pension Tables  
Components of Net Benefit Cost

   Three Months Ended September 30,  Nine Months Ended September 30,
   2015  2014  2015  2014
             
Components of net periodic benefit cost:                    
Interest cost  $15   $18   $44   $53 
Service cost   6    6    19    19 
Expected return on plan assets   (24)   (23)   (70)   (70)
Amortization of prior service costs   2    2    7    7 
Amortization of actuarial loss   36    29    92    87 
   $35   $32   $92   $96