Quarterly report pursuant to Section 13 or 15(d)

Senior Unsecured Notes (Summary Of Senior Unsecured Notes) (Details)

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Senior Unsecured Notes (Summary Of Senior Unsecured Notes) (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
May 25, 2012
Dec. 31, 2011
Long-Term Debt [Line Items]      
Senior Unsecured Notes $ 1,198,314,000   $ 1,119,267,000
Loss from early extinguishment of debt 4,415,000    
5.250% Senior Unsecured Notes, Due January 15, 2012 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes     99,988,000 [1]
Effective Rate 5.457% [1],[2]    
Interest rate of Senior Unsecured Notes 5.25% [1]    
Maturity date of the Senior Unsecured Notes Jan. 15, 2012 [1]    
6.150% Senior Unsecured Notes, Due December 15, 2012 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes     94,438,000 [3]
Effective Rate 6.894% [2],[3]    
Interest rate of Senior Unsecured Notes 6.15% [3]    
Maturity date of the Senior Unsecured Notes Dec. 15, 2012 [3]    
Principal amount of Senior Unsecured Notes redeemed   94,900,000  
Redemption price as percentage of principal   103.19%  
Redemption price of Senior Unsecured Notes   100,500,000  
Loss from early extinguishment of debt 3,300,000    
5.820% Senior Unsecured Notes, Due March 15, 2013 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes     25,972,000 [4]
Effective Rate 6.448% [2],[4]    
Interest rate of Senior Unsecured Notes 5.82% [4]    
Maturity date of the Senior Unsecured Notes Mar. 15, 2013 [4]    
Principal amount of Senior Unsecured Notes redeemed   26,100,000  
Redemption price as percentage of principal   103.87%  
Redemption price of Senior Unsecured Notes   27,400,000  
Loss from early extinguishment of debt 1,100,000    
4.600% Senior Unsecured Notes, Due June 15, 2013 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes 99,980,000   99,958,000
Effective Rate 4.742% [2]    
Interest rate of Senior Unsecured Notes 4.60%    
Maturity date of the Senior Unsecured Notes Jun. 15, 2013    
5.125% Senior Unsecured Notes, Due February 15, 2014 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes 200,330,000   200,509,000
Effective Rate 5.11% [2]    
Interest rate of Senior Unsecured Notes 5.125%    
Maturity date of the Senior Unsecured Notes Feb. 15, 2014    
5.125% Senior Unsecured Notes, Due January 15, 2015 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes 149,786,000   149,717,000
Effective Rate 5.297% [2]    
Interest rate of Senior Unsecured Notes 5.125%    
Maturity date of the Senior Unsecured Notes Jan. 15, 2015    
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes 200,256,000   200,313,000
Effective Rate 5.806% [2]    
Interest rate of Senior Unsecured Notes 5.80%    
Maturity date of the Senior Unsecured Notes Jan. 15, 2016    
7.750% Senior Unsecured Notes, Due August 15, 2019 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes 248,532,000   248,372,000
Effective Rate 8.017% [2]    
Interest rate of Senior Unsecured Notes 7.75%    
Maturity date of the Senior Unsecured Notes Aug. 15, 2019    
4.500% Senior Unsecured Notes Due April 18, 2022 [Member]
      
Long-Term Debt [Line Items]      
Senior Unsecured Notes $ 299,430,000    
Effective Rate 4.612% [2]    
Interest rate of Senior Unsecured Notes 4.50%    
Maturity date of the Senior Unsecured Notes Apr. 18, 2022    
[1] These notes were paid at maturity, primarily from borrowing on the Company’s unsecured revolving credit facility.
[2] Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable.
[3] On May 25, 2012, the Company redeemed $94.9 million principal amount of its 6.15 percent senior unsecured notes due December 15, 2012 (the “2002 Notes”). The redemption price, including a make-whole premium, was 103.19 percent of the principal amount of the 2002 Notes, plus accrued and unpaid interest up to the redemption date. The Company funded the redemption price, including accrued and unpaid interest, of approximately $100.5 million from borrowing on its unsecured revolving credit facility, as well as cash on hand. In connection with the redemption, the Company recorded approximately $3.3 million as a loss from early extinguishment of debt (including the write-off of unamortized deferred financing costs).
[4] On May 25, 2012, the Company redeemed $26.1 million principal amount of its 5.82 percent senior unsecured notes due March 15, 2013 (the “2003 Notes”). The redemption price, including a make-whole premium, was 103.87 percent of the principal amount of the 2003 Notes, plus accrued and unpaid interest up to the redemption date. The Company funded the redemption price, including accrued and unpaid interest, of approximately $27.4 million from borrowing on its unsecured revolving credit facility, as well as cash on hand. In connection with the redemption, the Company recorded approximately $1.1 million as a loss from early extinguishment of debt (including the write-off of unamortized deferred financing costs).