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Long-Term Debt (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Long term debt
Long-term debt	$ 2,013,368,000	$ 1,949,200,000
Less debt payable within one year	24,988,000	6,000,000
Total long-term debt	1,988,380,000	1,943,200,000
Aggregate maturities in 2011	15,500,000
Aggregate maturities in 2012	219,300,000
Aggregate maturities in 2013	23,200,000
Aggregate maturities in 2014	11,200,000
Aggregate maturities in 2015	166,000,000
7.76% notes, due 2011 thru 2016
Long term debt
Long-term debt	64,168,000
Debt instrument, stated interest rate percentage (as a percent)	7.76%
Aggregate principal amount	57,141,000
5.15% notes, due November 15, 2012
Long term debt
Long-term debt	200,000,000	200,000,000
Debt instrument, stated interest rate percentage (as a percent)	5.15%	5.15%
5.00% notes, due October 1, 2015
Long term debt
Long-term debt	150,000,000	150,000,000
Debt instrument, stated interest rate percentage (as a percent)	5.00%	5.00%
5.15% notes, due March 1, 2018
Long term debt
Long-term debt	200,000,000	200,000,000
Debt instrument, stated interest rate percentage (as a percent)	5.15%	5.15%
6.50% notes, due April 1, 2018
Long term debt
Long-term debt	500,000,000	500,000,000
Debt instrument, stated interest rate percentage (as a percent)	6.50%	6.50%
8.13% notes, due June 1, 2019
Long term debt
Long-term debt	700,000,000	700,000,000
Debt instrument, stated interest rate percentage (as a percent)	8.13%	8.13%
7.75% debentures, due July 15, 2026
Long term debt
Long-term debt	115,000,000	115,000,000
Debt instrument, stated interest rate percentage (as a percent)	7.75%	7.75%
Medium-term notes, 8.5% to 9.0% Series A, due 2011 thru 2021
Long term debt
Long-term debt	46,200,000	46,200,000
Debt instrument, stated interest rate percentage minimum (as a percent)	0.085	0.085
Debt instrument, stated interest rate percentage maximum (as a percent)	0.090	0.090
Medium-term notes, 7.3% to 7.6% Series B, due 2013 thru 2023
Long term debt
Long-term debt	30,000,000	30,000,000
Debt instrument, stated interest rate percentage minimum (as a percent)	0.073	0.073
Debt instrument, stated interest rate percentage maximum (as a percent)	0.076	0.076
Medium-term notes, 7.6% Series C, due 2018
Long term debt
Long-term debt	$ 8,000,000	$ 8,000,000
Debt instrument, stated interest rate percentage (as a percent)	7.60%	7.60%

X

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
-Paragraph 16, 20

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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- Definition

When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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-Publisher SEC
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-Number 210
-Section 02
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When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

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-Publisher SEC
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-Number 210
-Section 03
-Paragraph 16
-Article 7

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-Section 02
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Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

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-Publisher SEC
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Amount of long-term debt maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 47
-Paragraph 10
-Subparagraph b

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Amount of long-term debt maturing in year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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-Section 02
-Paragraph 22
-Article 5

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