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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]  
Summary Of Fair Value Of Pension Plan Assets
   
December 31, 2011
  
(Dollars in thousands)
  
Total
    
Level 1
    
Level 2
    
Level 3
  
                         
Cash and cash equivalents
                        
Short-term investment fund [a]
   $ 52,076     $ --     $ 52,076     $ --  
Equity
                                
U.S. large companies
                                
S&P 500 index fund [a]
     116,391       --       116,391       --  
Growth [b]
     133,556       133,556       --       --  
Value [b]
     138,241       138,241       --       --  
U.S. small companies
                                
Growth [b]
     36,483       36,483       --       --  
Value [b]
     64,764       64,764       --       --  
International
                                
Growth [b]
     69,982       69,982       --       --  
Value fund [a]
     79,855       --       79,855       --  
Fixed-income securities
                                
U.S. long-term debt instruments [c]
     287,828       42,663       245,165       --  
Low-duration fund [d]
     72,066       72,066       --       --  
Real estate
                                
Private fund [e]
     34,520       --       --       34,520  
Real estate investment trust index fund [a]
     19,608       --       19,608       --  
Total
   $ 1,105,370     $ 557,755     $ 513,095     $ 34,520  


   
December 31, 2010
  
(Dollars in thousands)
  
Total
    
Level 1
    
Level 2
    
Level 3
  
                         
Cash and cash equivalents
                        
Short-term investment fund [a]
   $ 17,356     $ --     $ 17,356     $ --  
Equity
                                
U.S. large companies
                                
S&P 500 index fund [a]
     113,869       --       113,869       --  
Growth [b]
     123,153       123,153       --       --  
Value [b]
     145,553       145,553       --       --  
U.S. small companies
                                
Growth [b]
     43,793       43,793       --       --  
Value [b]
     68,986       68,986       --       --  
International
                                
Growth [b]
     84,069       84,069       --       --  
Value fund [a]
     95,240       --       95,240       --  
Fixed-income securities
                                
U.S. long-term debt instruments [c]
     247,968       25,859       222,109       --  
Low-duration fund [d]
     85,659       85,659       --       --  
Real estate
                                
Private fund [e]
     29,553       --       --       29,553  
Real estate investment trust index fund [a]
     18,014       --       18,014       --  
Total
   $ 1,073,213     $ 577,072     $ 466,588     $ 29,553  

 
[a]
These funds are not publicly traded and do not have readily determinable fair values. Accordingly, they are valued at their net asset value per share. The underlying investments in the funds consist primarily of publicly traded securities with quoted market prices.
[b]      Publicly traded equity securities are valued at their closing market prices.
[c]
U.S. government securities are valued at their quoted market price, while corporate-debt
instruments are generally valued using observable bid-ask spreads or broker-provided pricing.
[d]      The low-duration fund is valued at its published net asset value per share.
 
[e]
The fair value of the private real estate fund is based on the fair values of the underlying assets, which consist of commercial and residential properties valued using periodic appraisals.
Summary Of The Change In Fair Value For Pension Assets
(Dollars in thousands)
  
Private real estate fund
  
       
Balance at December 31, 2009
   $ 27,323  
Actual return on plan assets:
        
Relating to assets still held at the reporting date
     2,230  
Balance at December 31, 2010
   $ 29,553  
Actual return on plan assets:
        
Relating to assets still held at the reporting date
     4,967  
Balance at December 31, 2011
   $ 34,520  
Changes In The Projected Benefit Obligation, The Fair Value Of Plan Assets And The Determination Of The Amounts Recognized
(Dollars in thousands)
  
Qualified Pension Plans
    
Non-Qualified Pension Plans
  
   
2011
    
2010
    
2011
    
2010
  
Change in projected benefit obligation:
                        
Projected benefit obligation at beginning of year
   $ 1,314,650     $ 1,166,176     $ 69,934     $ 66,847  
Interest cost on projected benefit obligation
     71,308       69,136       3,787       3,879  
Actuarial loss
     183,293       118,385       7,587       4,155  
Benefits paid
     (43,115 )     (39,047 )     (5,079 )     (4,947 )
Projected and accumulated benefit obligation at
                                
end of year
   $ 1,526,136     $ 1,314,650     $ 76,229     $ 69,934  
                                 
Change in plan assets:
                                
Fair value of plan assets at beginning of year
   $ 1,073,213     $ 902,276     $ --     $ --  
Actual return on plan assets
     12,657       116,223       --       --  
Con-way contributions
     62,615       93,761       5,079       4,947  
Benefits paid
     (43,115 )     (39,047 )     (5,079 )     (4,947 )
Fair value of plan assets at end of year
   $ 1,105,370     $ 1,073,213     $ --     $ --  
                                 
Funded status of the plans
   $ (420,766 )   $ (241,437 )   $ (76,229 )   $ (69,934 )
                                 
Amounts recognized in the balance sheet consist of:
                                
Current liabilities
   $ --     $ --     $ (5,051 )   $ (4,757 )
Long-term liabilities
     (420,766 )     (241,437 )     (71,178 )     (65,177 )
Net amount recognized
   $ (420,766 )   $ (241,437 )   $ (76,229 )   $ (69,934 )
                                 
Plans with a projected and accumulated benefit obligation in
                                
   excess of plan assets:
                                
Projected and accumulated benefit obligation
   $ 1,503,510     $ 1,290,483     $ 76,229     $ 69,934  
Fair value of plan assets
     1,074,284       1,040,882       --       --  
                                 
Weighted-average assumptions as of December 31:
                                
Discount rate
     4.65 %     5.55 %     4.65 %     5.55 %
Changes In The Benefit Obligation And The Determination Of The Amounts Recognized
(Dollars in thousands)
  
 
  
   
2011
    
2010
  
Change in benefit obligation:
            
Projected benefit obligation at beginning of year
   $ 92,993     $ 89,843  
Service cost – benefits earned during the year
     1,441       1,405  
Interest cost on projected benefit obligation
     4,492       4,832  
Actuarial loss
     3,493       2,354  
Participant contributions
     2,911       2,856  
Plan amendments
     --       (198 )
Benefits paid
     (6,913 )     (8,099 )
Projected and accumulated benefit obligation at end of year
   $ 98,417     $ 92,993  
                 
Funded status of the plan
   $ (98,417 )   $ (92,993 )
Amounts recognized in the balance sheet consist of :
                
Current liabilities
   $ (6,822 )   $ (6,763 )
Long-term liabilities
     (91,595 )     (86,230 )
Net amount recognized
   $ (98,417 )   $ (92,993 )
                 
Discount rate assumption as of December 31
     4.30 %     5.00 %
Health-Care Cost Trend Rates Used To Determine The Benefit Obligation
 
2011
  
2010
  
 
Health-care cost trend rate assumed for next year
               7.60%
 
               7.80%
  
 
Rate to which the cost trend rate is assumed to
      decline (the ultimate trend rate)
               4.50%
  
               4.50%
  
 
Year that the rate reaches the ultimate trend rate
              2027
  
              2027
  
Defined Benefit Pension Plans [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Amounts Included In Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized In Net Periodic Benefit Expense
(Dollars in thousands)
  
Qualified Pension Plans
    
Non-Qualified Pension Plans
  
   
2011
    
2010
    
2011
    
2010
  
Actuarial loss
   $ (690,688 )   $ (444,663 )   $ (31,421 )   $ (24,512 )
                                 
Components Of Net Periodic Benefit Expense (Income)
(Dollars in thousands)
  
Qualified Pension Plans
    
Non-Qualified Pension Plans
  
   
2011
    
2010
    
2009
    
2011
    
2010
    
2009
  
Net periodic benefit expense (income):
                                    
Interest cost on benefit obligation
   $ 71,308     $ 69,136     $ 69,857     $ 3,787     $ 3,879     $ 4,203  
Expected return on plan assets
     (85,935 )     (75,039 )     (60,527 )     --       --       --  
Amortization of actuarial loss (gain)
     10,546       9,071       17,235       678       452       (2,366 )
Net periodic benefit expense (income)
   $ (4,081 )   $ 3,168     $ 26,565     $ 4,465     $ 4,331     $ 1,837  
                                                 
Amounts recognized in other comprehensive income or loss
                                                
Actuarial loss (gain)
   $ 256,571     $ 77,201     $ (192,798 )   $ 7,587     $ 4,219     $ (6,419 )
Amortization of actuarial loss (gain)
     (10,546 )     (9,071 )     (17,235 )     (678 )     (452 )     2,366  
Loss (gain) recognized in other comprehensive income or loss
   $ 246,025     $ 68,130     $ (210,033 )   $ 6,909     $ 3,767     $ (4,053 )
                                                 
Weighted-average assumptions used to calculate net cost:
                                                
Discount rate
     5.55 %     6.05 %     6.10 %     5.55 %     6.05 %     6.10 %
Discount rate – curtailment
     N/A       N/A       7.85 %     N/A       N/A       7.85 %
Expected long-term rate of return
  on plan assets
     8.00 %     8.50 %     8.50 %     --       --       --  
Expected Benefit Payments
(Dollars in thousands)
  
Qualified
    
Non-Qualified
  
   
Pension Plans
    
Pension Plans
  
Year ending December 31:
            
2012
   $ 46,428     $ 5,051  
2013
     49,444       4,963  
2014
     52,795       4,951  
2015
     56,468       4,925  
2016
     60,498       4,947  
2017-2021
     366,223       24,684  
Postretirement Medical Plan [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Amounts Included In Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized In Net Periodic Benefit Expense
(Dollars in thousands)
  
2011
    
2010
  
Actuarial gain
   $ 374     $ 3,867  
Prior-service credit
     2,786       3,998  
    $ 3,160     $ 7,865  
Components Of Net Periodic Benefit Expense (Income)
(Dollars in thousands)
  
 
  
   
2011
    
2010
    
2009
  
Net periodic benefit expense:
                  
Service cost - benefits earned during the year
   $ 1,441     $ 1,405     $ 1,539  
Interest cost on benefit obligation
     4,492       4,832       5,578  
Amortization of prior-service credit
     (1,212 )     (1,202 )     (1,222 )
Net periodic benefit expense
   $ 4,721     $ 5,035     $ 5,895  
                         
Amounts recognized in other comprehensive income or loss:
                        
Actuarial loss (gain)
   $ 3,493     $ 2,354     $ (10,353 )
Plan amendments
     --       (198 )     --  
Amortization of prior-service credit
     1,212       1,202       1,222  
Loss (gain)  recognized in other comprehensive income or loss
   $ 4,705     $ 3,358     $ (9,131 )
 
                        
 Discount rate assumption used to calculate interest cost:
     5.00 %     5.65 %     6.38 %
Expected Benefit Payments
(Dollars in thousands)
    
   
Benefit Payments
Year ending December 31:
    
 
2012
  
$                 6,822
 
2013
  
7,044
 
2014
  
7,347
 
2015
  
7,603
 
2016
  
7,948
 
2017-2021
  
41,068