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Debt And Other Financing Arrangements (Summary Of Company's Senior Notes) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Debt Instrument [Line Items]  
Senior note carrying value$ 3,335,363[1]$ 3,391,668[1]
Estimated fair value2,963,0873,227,404
Unsecured Senior Notes Eight Point One Two Five Percentage Due February 2011[Member]
  
Debt Instrument [Line Items]  
Senior note carrying value [2]13,900[2]
Debt interest rate8.125%8.125%
Debt maturity dateFebruary 2011February 2011
Unsecured Senior Notes 5.45% Due August 2012 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value96,955[3]104,823[3]
Debt interest rate5.45%5.45%
Debt maturity dateAugust 2012August 2012
Unsecured Senior Notes 6.25% Due February 2013 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value62,662[3]62,617[3]
Debt interest rate6.25%6.25%
Debt maturity dateFebruary 2013February 2013
Unsecured Senior Notes 5.125% Due October 2013 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value116,871[3]160,212[3]
Debt interest rate5.125%5.125%
Debt maturity dateOctober 2013October 2013
Unsecured Senior Notes 5.25% Due January 2014 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value335,865[3]335,848[3]
Debt interest rate5.25%5.25%
Debt maturity dateJanuary 2014January 2014
Unsecured Senior Notes 5.7% Due May 2014 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value311,187[3]309,048[3]
Debt interest rate5.70%5.70%
Debt maturity dateMay 2014May 2014
Unsecured Senior Notes 5.2% Due February 2015 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value244,873[3]244,839[3]
Debt interest rate5.20%5.20%
Debt maturity dateFebruary 2015February 2015
Unsecured Senior Notes 5.25% Due June 2015 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value402,202[3]397,700[3]
Debt interest rate5.25%5.25%
Debt maturity dateJune 2015June 2015
Unsecured Senior Notes 6.5% Due May 2016 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value468,521[3]466,644[3]
Debt interest rate6.50%6.50%
Debt maturity dateMay 2016May 2016
Unsecured Senior Notes 7.625% Due October 2017 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value149,346[2]149,265[2]
Debt interest rate7.625%7.625%
Debt maturity dateOctober 2017October 2017
Unsecured Senior Notes 7.875% Due June 2032 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value299,098[3]299,065[3]
Debt interest rate7.875%7.875%
Debt maturity dateJune 2032June 2032
Unsecured Senior Notes 6.375% Due May 2033 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value398,400[3]398,344[3]
Debt interest rate6.375%6.375%
Debt maturity dateMay 2033May 2033
Unsecured Senior Notes 6% Due February 2035 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value299,383[3]299,363[3]
Debt interest rate6.00%6.00%
Debt maturity dateFebruary 2035February 2035
Unsecured Senior Notes 7.375% Due June 2046 [Member]
  
Debt Instrument [Line Items]  
Senior note carrying value$ 150,000[3]$ 150,000[3]
Debt interest rate7.375%7.375%
Debt maturity dateJune 2046June 2046
[1]The recorded carrying value reflects the impact of various discounts and premiums that are amortized to interest cost over the respective terms of the senior notes
[2]Not redeemable prior to maturity, guaranteed on a senior basis by certain wholly-owned subsidiaries
[3]Redeemable prior to maturity, guaranteed on a senior basis by certain wholly-owned subsidiaries