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Fair Value Of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Fair Value Of Financial Instruments [Abstract]    
Schedule Of Assets And Liabilities Measured On Recurring Basis At Fair Value
   
December 31, 2011
 
         
Fair Value Measurements Using
 
   
Total
Fair Value
Measurements
   
Quoted Prices in Active
Markets for Identical
Assets or Liabilities
(Level 1)
   
Significant Other
 Observable Inputs
(Level 2)
 
Investments classified as current assets:
                 
  Investments available for sale:
                 
Bonds and notes:
                 
   U.S. Government and agencies
  $ 139,952     $ 139,952     $  
   All other corporates
    5,719       5,719        
Other
    306             306  
Non-current investments:
                       
  Investments available for sale:
                       
Bonds and notes:
                       
    U.S. Government-Sponsored Enterprises
    622,191             622,191  
    All other corporates
    66,542       26,703       39,839  
Equity securities:
                       
   Common stocks:
                       
       Banks, trusts and insurance companies
    50,971       50,971        
       Industrial, miscellaneous and all other
    1,313,688       1,313,688        
Other
    501             501  
Investments in associated companies
    1,198,029       1,198,029       –   
Total
  $ 3,397,899     $ 2,735,062     $ 662,837  
                         
Commodity contracts - other current assets
  $ 3,816     $ 88     $ 3,728  
                         
Other current liabilities:
                       
  Commodity contracts
  $ (2,802 )   $     $ (2,802 )
  Other
    (955 )     (955 )     –   
Total
  $ (3,757 )   $ (955 )   $ (2,802 )
   
December 31, 2010
 
         
Fair Value Measurements Using
 
   
Total
Fair Value
Measurements
   
Quoted Prices in Active
Markets for Identical
Assets or Liabilities
(Level 1)
   
Significant Other
Observable Inputs
(Level 2)
 
Investments classified as current assets:
                 
  Investments available for sale:
                 
Bonds and notes:
                 
   U.S. Government and agencies
  $ 247,017     $ 247,017     $  
   All other corporates
    6,572       6,324       248  
Non-current investments:
                       
  Investments available for sale:
                       
Bonds and notes:
                       
    U.S. Government and agencies
    7,716             7,716  
    U.S. Government-Sponsored Enterprises
    823,383             823,383  
    All other corporates
    192,533       150,193       42,340  
Equity securities:
                       
   Common stocks:
                       
       Banks, trusts and insurance companies
    49,276       49,276        
       Industrial, miscellaneous and all other
    2,593,331       2,593,331        
Investments in associated companies
    1,314,227       1,314,227       –   
Total
  $ 5,234,055     $ 4,360,368     $ 873,687  
                         
Other current liabilities
  $ (2,413 )   $ (1,878 )   $ (535 )
Schedule Of Assets And Liabilities Measured On Nonrecurring Basis At Fair Value  
Schedule Of Fair Value Of Financial Instruments
   
2011
   
2010
 
   
Carrying
   
Fair
   
Carrying
   
Fair
 
   
Amount
   
Value
   
Amount
   
Value
 
                         
Financial Assets:
                       
Investments:
                       
Current
  $ 150,135     $ 150,135     $ 264,572     $ 264,572  
Non-current
    2,226,875       2,226,875       3,832,659       3,832,659  
Cash and cash equivalents
    168,490       168,490       441,340       441,340  
Notes receivable:
                               
Current
    1,675       1,675       740       740  
Non-current
    3,531       3,531       2,633       2,633  
Commodity contracts
    3,816       3,816              
                                 
Financial Liabilities:
                               
Indebtedness:
                               
Current
    446,743       446,743       534,572       452,142  
Non-current
    1,874,389       1,943,697       1,546,655       1,675,842  
Securities sold not owned
    955       955       1,878       1,878  
Commodity contracts
    2,802       2,802              
                                 
Redeemable noncontrolling interests
    235,909       235,909              
                                 
Swap agreements:
                               
Interest rate swaps
                (535 )     (535 )