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Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2012
Comprehensive Income [Abstract]  
Accumulated other comprehensive loss, net of tax
The components of accumulated other comprehensive loss, net of tax at December 31, 2012, 2011 and 2010 are as follows:
 
($ in thousands)
 
Pension Costs
  
Postretirement Costs
  
Deferred taxes on pension and OPEB costs
  
All other
  
Total
 
Balance at January 1, 2010
 $(374,157) $(21,554) $150,284  $(92) $(245,519)
Other comprehensive income before reclassifications
                 
    (2,301)  11,424   (8,428)  424   1,119 
Amounts reclassified from accumulated other comprehensive loss
                 
    27,194   (3,239)  (9,104)  -   14,851 
Net current-period other comprehensive income (loss)
                 
    24,893   8,185   (17,532)  424   15,970 
Balance at December 31, 2010
  (349,264)  (13,369)  132,752   332   (229,549)
Other comprehensive income before reclassifications
  (241,064)  (22,668)  100,978   (482)  (163,236)
                      
Amounts reclassified from accumulated other comprehensive loss
  15,165   (5,774)  (3,569)  -   5,822 
                      
Net current-period other comprehensive income (loss)
  (225,899)  (28,442)  97,409   (482)  (157,414)
                      
Balance at December 31, 2011
  (575,163)  (41,811)  230,161   (150)  (386,963)
Other comprehensive income before reclassifications
  (152,402)  (29,922)  68,871       (113,453)
                -     
Amounts reclassified from accumulated other comprehensive loss
  29,691   (2,531)  (10,320)      16,840 
                -     
Net current-period other comprehensive income (loss)
  (122,711)  (32,453)  58,551   -   (96,613)
                      
Balance at December 31, 2012
 $(697,874) $(74,264) $288,712  $(150) $(483,576)
                      
Other comprehensive income (loss)
    The significant items reclassified from each component of accumulated other comprehensive income (loss) for the years ended December 31, 2012, 2011 and 2010 are as follows:
 
              
($ in thousands)
 
Amount Reclassified from
    
Affected Line Item in the
  
Accumulated Other Comprehensive Loss (a)
      Statement Where Net
  Details about Accumulated Other Comprehensive Loss Components 
2012
  
2011
  
2010
   Income is Presented
Amortization of Pension Cost Items (b)
          
 
Prior-service costs
 $199  $199  $199  
 
Actuarial gains/(losses)
  (29,890)  (15,364)  (27,393) 
      (29,691)  (15,165)  (27,194)
Income before income taxes
 
Tax impact
  11,282   5,763   10,334 
Income tax (expense) benefit
     $(18,409) $(9,402) $(16,860)
Net income
Amortization of Postretirement Cost Items (b)
             
 
Prior-service costs
 $10,068  $10,198  $8,158  
 
Actuarial gains/(losses)
  (7,537)  (4,424)  (4,919) 
      2,531   5,774   3,239 
Income before income taxes
 
Tax impact
  (962)  (2,194)  (1,230)
Income tax (expense) benefit
     $1,569  $3,580  $2,009 
Net income
                 
(a)
Amounts in parentheses indicate losses.
          
                 
(b)
These accumulated other comprehensive loss components are included in the computation of net periodic
 
pension cost (see Note 17 - Retirement Plans for additional details).