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Retirement Plans (Tables)
12 Months Ended
Dec. 31, 2012
Retirement Plans [Abstract]  
Projected Benefit Obligations, Fair Values of Plan Assets and Amounts Recognized in the Balance Sheet
The following tables set forth the pension plan's projected benefit obligations and fair values of plan assets as of December 31, 2012 and 2011 and the components of total periodic pension benefit cost for the years ended December 31, 2012, 2011 and 2010:

 
($ in thousands)
 
2012
  
2011
 
        
Change in projected benefit obligation (PBO)
      
PBO at beginning of year
 $1,799,313  $1,644,657 
Service cost
  43,688   38,879 
Interest cost
  78,027   84,228 
Actuarial loss
  196,304   160,390 
Benefits paid
  (172,601)  (128,841)
PBO at end of year
 $1,944,731  $1,799,313 
          
Change in plan assets
        
Fair value of plan assets at beginning of year
 $1,257,990  $1,290,274 
Actual return on plan assets
  139,679   19,883 
Employer contributions, net of transfers
  28,598   76,674 
Benefits paid
  (172,601)  (128,841)
Fair value of plan assets at end of year
 $1,253,666  $1,257,990 
          
Funded status
 $(691,065) $(541,323)
          
Amounts recognized in the consolidated balance sheet
        
Current liabilities
 $(60,386) $- 
Pension and other postretirement benefits
 $(630,679) $(541,323)
Accumulated other comprehensive loss
 $697,874  $575,163 
          
The following tables set forth the OPEB plan's benefit obligations, fair values of plan assets and the postretirement benefit liability recognized on our consolidated balance sheets at December 31, 2012 and 2011 and the components of net periodic postretirement benefit costs for the years ended December 31, 2012, 2011 and 2010.
        
($ in thousands)
 
2012
  
2011
 
        
Change in benefit obligation
      
        
Benefit obligation at beginning of year
 $391,596  $353,131 
Service cost
  10,812   8,958 
Interest cost
  17,842   17,722 
Plan participants' contributions
  4,059   4,389 
Actuarial loss
  30,958   22,564 
Benefits paid
  (15,974)  (15,168)
Plan change
  (743)  - 
Benefit obligation at end of year
 $438,550  $391,596 
          
Change in plan assets
        
Fair value of plan assets at beginning of year
 $5,101  $6,240 
Actual return on plan assets
  466   219 
Plan participants' contributions
  4,059   4,389 
Employer contribution
  11,403   9,421 
Benefits paid
  (15,974)  (15,168)
Fair value of plan assets at end of year
 $5,055  $5,101 
          
Funded status
 $(433,495) $(386,495)
          
Amounts recognized in the consolidated balance sheet
        
Current liabilities
 $(9,116) $(9,117)
Pension and other postretirement benefits
 $(424,379) $(377,378)
Accumulated other comprehensive loss
 $74,264  $41,811 
          
Net Periodic Benefit Cost
   
Expected in
          
($ in thousands)
 
2013
  
2012
  
2011
  
2010
 
              
Components of total periodic pension benefit cost
            
Service cost
    $43,688  $38,879  $21,169 
Interest cost on projected benefit obligation
     78,027   84,228   67,735 
Expected return on plan assets
     (95,777)  (100,558)  (69,831)
Amortization of prior service cost/(credit)
 $8   (199)  (199)  (199)
Amortization of unrecognized loss
  40,287   29,890   15,364   27,393 
Net periodic pension benefit cost
      55,629   37,714   46,267 
Special termination charge
      -   -   69 
Total periodic pension benefit cost
     $55,629  $37,714  $46,336 
                  
($ in thousands)
 
Expected in
          
   
2013
  
2012
  
2011
  
2010
 
Components of net periodic postretirement benefit cost
            
Service cost
    $10,812  $8,958  $7,956 
Interest cost on projected benefit obligation
     17,842   17,722   17,883 
Expected return on plan assets
     (172)  (324)  (436)
Amortization of prior service cost/(credit)
 $(6,101)  (10,068)  (10,198)  (8,157)
Amortization of unrecognized loss
  8,911   7,537   4,424   4,917 
Net periodic postretirement benefit cost
     $25,951  $20,582  $22,163 
                  
Weighted Average Asset Allocations, By Asset Category
The plan's weighted average asset allocations at December 31, 2012 and 2011 by asset category are as follows:
 
        
   
2012
  
2011
 
Asset category:
      
   Equity securities
  43%  45%
   Debt securities
  40%  40%
   Alternative investments
  14%  14%
   Cash and other
  3%  1%
          Total
  100%  100%
          
Expected Benefit Payments over the Next Ten Years
The plan's expected benefit payments over the next 10 years are as follows:
 

($ in thousands)
 
     
Year
  
Amount
 
2013
  $113,424 
2014
   120,836 
2015
   128,624 
2016
   134,922 
2017
   138,759 
 2018 - 2022   729,847 
Total
  $1,366,412 
       
The OPEB plan's expected benefit payments over the next 10 years are as follows:
 
($ in thousands)
          
   
Gross
  
               Medicare Part D
Year
  
Benefits
  
Subsidy
  
Total
 
2013
  $14,010  $ 430  $13,580 
2014
   15,591    533   15,058 
2015
   17,448    644   16,804 
2016
   19,457    760   18,697 
2017
   21,347    924   20,423 
 2018 - 2022   131,410    7,838   123,572 
Total
  $219,263  $ 11,129  $208,134 
                
Schedule of Assumptions Used
Assumptions used in the computation of annual pension costs and valuation of the year-end obligations were as follows:
 
 
2012
 
2011
 
2010
Discount rate - used at year end to value obligation
4.00%
 
4.50%
 
5.25%
Discount rate - used to compute annual cost
4.50%
 
5.25%
 
5.75%
Expected long-term rate of return on plan assets
7.75%
 
8.00%
 
8.00%
Rate of increase in compensation levels
2.50%
 
2.50%
 
3.00%
 
Assumptions used in the computation of annual OPEB costs and valuation of the year-end OPEB obligations were as follows:
 
 
2012
 
2011
 
2010
Discount rate - used at year end to value obligation
4.00% - 4.20%
 
4.50% - 4.75%
 
5.25%
Discount rate - used to compute annual cost
4.50% - 4.75%
 
5.25%
 
5.75%
Expected long-term rate of return on plan assets
4.00% - 3.00%
 
6.00% - 3.00%
 
6.00%
Net Periodic Benefit Cost Not yet Recognized
The amounts in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost at December 31, 2012 and 2011 are as follows:

($ in thousands)
 
Pension Plan
  
OPEB
 
   
2012
  
2011
  
2012
  
2011
 
Net actuarial loss
 $697,511  $574,998  $105,970  $82,841 
Prior service cost/(credit)
  363   165   (31,706)  (41,030)
   Total
 $697,874  $575,163  $74,264  $41,811 
                  
Amounts Recognized As a Component of Accumulated Comprehensive Income
The amounts recognized as a component of accumulated comprehensive loss for the years ended December 31, 2012 and 2011 are as follows:
 
   
Pension Plan
  
OPEB
 
($ in thousands)
 
2012
  
2011
  
2012
  
2011
 
              
Accumulated other comprehensive loss at
            
   beginning of year
 $575,163  $349,264  $41,811  $13,369 
                  
Net actuarial gain (loss) recognized during year
  (29,890)  (15,364)  (7,537)  (4,424)
Prior service (cost)/credit recognized during year
  199   199   10,068   10,198 
Net actuarial loss (gain) occurring during year
  152,402   241,064   30,665   22,668 
Prior service cost (credit) occurring during year
  -   -   (743)  - 
Net amount recognized in comprehensive income
                
   for the year
  122,711   225,899   32,453   28,442 
Accumulated other comprehensive loss at end of year
 $697,874  $575,163  $74,264  $41,811