text: **Pension Obligations**
  Our retiree pension plans had a funding deficit of approximately $172 
  million at December 31, 2013. We have been making special minimum 
  monthly payments in addition to our regular contributions to eliminate 
  the pension liability. During 2013, our funding deficit was reduced by 
  $162 million. 
  
  accrued obligations in the future. See*Critical accounting estimates*for 
  more information. 
  
  *Purchase of Annuities*
  From time to time we have made additional lump-sum contributions to 
  our pension plans, and the pension plans have purchased annuities 
  from insurance companies to fund the pension benefit obligations for 
  certain groups of 
  retired employees in the plans. Purchasing the 
  annuities relieves us of our primary responsibility for that portion of 
  the accrued benefit obligations for the retired employees and eliminates 
  the significant risk associated with the obligations. 
  The special payments, including contributions associated with benefits 
  paid from the plans, were approximately $7 million in 2013. We expect 
  our total estimated funding requirements to be $96 million in 2014 and 
  to be adjusted annually thereafter, based on various market factors 
  such as interest rates and expected returns and staffing assumptions. 
  
  We did not make any additional lump-sum contributions to our pension 
  plans in 2013 or 2012, and the pension plans did not purchase 
  additional annuities. 
  Changes in factors such as the discount rate, increase in compensation 
  and the expected return on plan assets can affect the accrued benefit 
  obligation, pension expense and the deficiency of plan assets over 