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Debt (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Debt Instrument [Line Items]          
Interest rate swap agreements $ 6,075,000   $ 6,075,000   $ (4,290,000)
Current portion of debt (3,503,000)   (3,503,000)   (3,537,000)
Long-term debt, net 1,955,977,000   1,955,977,000   2,106,758,000
Redeemed debt, aggregate principal amount     175,000,000    
Debt redemption costs 200,000   1,300,000    
Carrying amounts of convertible debt and related equity [Abstract]          
Carrying value of equity component 619,223,000   619,223,000   619,223,000
Principal amount of convertible debt 1,372,500,000   1,372,500,000   1,372,500,000
Net carrying value of convertible debt 937,486,000   937,486,000   925,624,000
Standby Letters of Credit Outstanding 20,000,000   20,000,000    
Amortized expense of deferred debt issuance cost 1,400,000 3,500,000 2,800,000 4,700,000  
6.125% Senior Subordinated Notes, Due 2013 [Member]
         
Debt Instrument [Line Items]          
Debt instrument maturity date 2013   2013   2013
Debt instrument stated interest rate (in hundredths) 6.125%   6.125%   6.125%
Long-term debt, gross 75,000,000   75,000,000   250,000,000
6.875% Senior Subordinated Notes, Due 2015 [Member]
         
Debt Instrument [Line Items]          
Debt instrument maturity date 2015   2015   2015
Debt instrument stated interest rate (in hundredths) 6.875%   6.875%   6.875%
Long-term debt, gross 525,000,000   525,000,000   525,000,000
7.75% Senior Subordinated Notes, Due 2020 [Member]
         
Debt Instrument [Line Items]          
Debt instrument maturity date 2020   2020   2020
Debt instrument stated interest rate (in hundredths) 7.75%   7.75%   7.75%
Long-term debt, gross 400,000,000   400,000,000   400,000,000
Floating interest rate on the interest rate swap agreements (in hundredths) 4.27%   4.27%    
3.75% Convertible Senior Subordinated Notes, Due 2025 [Member]
         
Debt Instrument [Line Items]          
Debt instrument maturity date 2025   2025   2025
Debt instrument stated interest rate (in hundredths) 3.75%   3.75%   3.75%
Long-term debt, gross 575,000,000   575,000,000   575,000,000
Unamortized debt discount - Convertible debt (217,655,000)   (217,655,000)   (221,495,000)
Remaining amortization period for the debt discount (in years) 14.5   14.5    
Effective interest rates for the liability components of Convertible Debentures (in hundredths)     8.25%    
4.00% Junior Subordinated Convertible Debentures, Due 2033 [Member]
         
Debt Instrument [Line Items]          
Debt instrument maturity date 2033   2033   2033
Debt instrument stated interest rate (in hundredths) 4.00%   4.00%   4.00%
Long-term debt, gross 345,000,000   345,000,000   345,000,000
Unamortized debt discount - Convertible debt (142,545,000)   (142,545,000)   (143,718,000)
Remaining amortization period for the debt discount (in years) 22   22    
Effective interest rates for the liability components of Convertible Debentures (in hundredths)     8.01%    
3.25% Convertible Senior Debentures, Due 2035 [Member]
         
Debt Instrument [Line Items]          
Debt instrument maturity date 2035   2035   2035
Debt instrument stated interest rate (in hundredths) 3.25%   3.25%   3.25%
Long-term debt, gross 452,500,000   452,500,000   452,500,000
Unamortized debt discount - Convertible debt (74,814,000)   (74,814,000)   (81,663,000)
Remaining amortization period for the debt discount (in years) 4.5   4.5    
Effective interest rates for the liability components of Convertible Debentures (in hundredths)     7.625%    
Capitalized Lease and Other Debt Obligations [Member]
         
Debt Instrument [Line Items]          
Long-term debt, gross $ 15,919,000   $ 15,919,000   $ 13,961,000