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Borrowings and Lines of Credit (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Debt Instrument [Line Items]      
Carrying amount $ 2,195,267,000   $ 2,187,252,000
Current installments (3,510,000)   (1,022,000)
Total long-term debt 2,191,757,000   2,186,230,000
Interest expense and interest income [Abstract]      
Interest expense 31,645,000 31,036,000  
Interest income (1,618,000) (2,718,000)  
Interest expense, net 30,027,000 28,318,000  
Note due 2015 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, stated interest rate (in hundredths) 4.875%    
Term of debt instrument (in years) 10    
Debt instruments, maturity date Oct. 15, 2015    
Carrying amount 299,293,000   299,244,000
Note due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, stated interest rate (in hundredths) 5.45%    
Term of debt instrument (in years) 10    
Debt instruments, maturity date Mar. 15, 2018    
Carrying amount 348,021,000   347,938,000
Note due 2021 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, stated interest rate (in hundredths) 4.30%    
Term of debt instrument (in years) 10    
Debt instruments, maturity date Mar. 01, 2021    
Carrying amount 449,767,000   449,761,000
Note due 2038 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, stated interest rate (in hundredths) 6.60%    
Term of debt instrument (in years) 30    
Debt instruments, maturity date Mar. 15, 2038    
Carrying amount 247,705,000   247,683,000
Note due 2041 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, stated interest rate (in hundredths) 5.375%    
Term of debt instrument (in years) 30    
Debt instruments, maturity date Mar. 01, 2041    
Carrying amount 345,392,000   345,352,000
Debentures due 2028 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, stated interest rate (in hundredths) 6.65%    
Term of debt instrument (in years) 30    
Debt instruments, maturity date Jun. 01, 2028    
Carrying amount 199,422,000   199,414,000
Debentures due 2035 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, stated interest rate (in hundredths) 5.375%    
Term of debt instrument (in years) 30    
Debt instruments, maturity date Oct. 15, 2035    
Carrying amount 296,247,000   296,208,000
Other long term debt instruments [Member]
     
Debt Instrument [Line Items]      
Carrying amount 9,420,000   1,652,000
Credit Agreement [Member]
     
Debt Instrument [Line Items]      
Unsecured revolving credit facility, maximum borrowing capacity $ 1,000,000,000    
Revolving credit facility expiration date 2016-11-10