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Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2014
Benefit Plans [Abstract]  
Net Periodic Benefit Cost
NOTE 9. Pension and Other Postretirement Benefits
                   
Components of Net Periodic Benefit Cost
                   
  Three Months Ended June 30,
              Other Postretirement
  Pension Benefits SERP Benefits
  2014 2013 2014 2013 2014 2013
Service cost$0 $1,333 $71 $313 $ 316 $ 337
Interest cost 1,922  1,794  122  102   247   217
Expected return on plan assets (2,337)  (2,412)  0  0  0  0
Amortization of prior service cost 0  6  37  54   28   29
Amortization of transition obligation 0  0  0  0  0   2
Amortization of net actuarial loss 121  757  29  57  0  42
 Net periodic postretirement benefit cost$(294) $1,478 $259 $526 $ 591 $ 627
                   
   Six Months Ended June 30,
              Other Postretirement
  Pension Benefits SERP Benefits
  2014 2013 2014 2013 2014 2013
Service cost$0 $2,666 $143 $626 $633 $674
Interest cost 3,845  3,588  245  204  493  434
Expected return on plan assets (4,673)  (4,823)  0  0  0  0
Amortization of prior service cost 0  12  73  109  57  58
Amortization of transition obligation 0  0  0  0  0  4
Amortization of net actuarial loss 241  1,514  57  113  0  84
 Net periodic postretirement benefit cost$(587) $2,957 $518 $1,052 $1,183 $1,254