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 $)
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
5.250% Senior Unsecured Notes, Due January 15, 2012 [Member]
Dec. 31, 2011
5.250% Senior Unsecured Notes, Due January 15, 2012 [Member]
Jun. 30, 2012
6.150% Senior Unsecured Notes, Due December 15, 2012 [Member]
May 25, 2012
6.150% Senior Unsecured Notes, Due December 15, 2012 [Member]
Dec. 31, 2011
6.150% Senior Unsecured Notes, Due December 15, 2012 [Member]
Jun. 30, 2012
5.820% Senior Unsecured Notes, Due March 15, 2013 [Member]
May 25, 2012
5.820% Senior Unsecured Notes, Due March 15, 2013 [Member]
Dec. 31, 2011
5.820% Senior Unsecured Notes, Due March 15, 2013 [Member]
Jun. 30, 2012
4.600% Senior Unsecured Notes, Due June 15, 2013 [Member]
Dec. 31, 2011
4.600% Senior Unsecured Notes, Due June 15, 2013 [Member]
Jun. 30, 2012
5.125% Senior Unsecured Notes, Due February 15, 2014 [Member]
Dec. 31, 2011
5.125% Senior Unsecured Notes, Due February 15, 2014 [Member]
Jun. 30, 2012
5.125% Senior Unsecured Notes, Due January 15, 2015 [Member]
Dec. 31, 2011
5.125% Senior Unsecured Notes, Due January 15, 2015 [Member]
Jun. 30, 2012
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]
Dec. 31, 2011
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]
Jun. 30, 2012
7.750% Senior Unsecured Notes, Due August 15, 2019 [Member]
Dec. 31, 2011
7.750% Senior Unsecured Notes, Due August 15, 2019 [Member]
Jun. 30, 2012
4.500% Senior Unsecured Notes Due April 18, 2022 [Member]
Long-Term Debt [Line Items]                                            
Senior Unsecured Notes $ 1,198,294,000 $ 1,198,294,000 $ 1,119,267,000   $ 99,988,000 [1]     $ 94,438,000 [2]     $ 25,972,000 [3] $ 99,973,000 $ 99,958,000 $ 200,390,000 $ 200,509,000 $ 149,763,000 $ 149,717,000 $ 200,275,000 $ 200,313,000 $ 248,478,000 $ 248,372,000 $ 299,415,000
Effective Rate       5.457% [1],[4]   6.894% [2],[4]     6.448% [3],[4]     4.742% [4]   5.11% [4]   5.297% [4]   5.806% [4]   8.017% [4]   4.612% [4]
Interest rate of Senior Unsecured Notes       5.25% [1]   6.15% [2]     5.82% [3]     4.60%   5.125%   5.125%   5.80%   7.75%   4.50%
Maturity date of the Senior Unsecured Notes       Jan. 15, 2012 [1]   Dec. 15, 2012 [2]     Mar. 15, 2013 [3]     Jun. 15, 2013   Feb. 15, 2014   Jan. 15, 2015   Jan. 15, 2016   Aug. 15, 2019   Apr. 18, 2022
Principal amount of Senior Unsecured Notes redeemed             94,900,000     26,100,000                        
Redemption price as percentage of principal             103.19167%     103.86859%                        
Redemption price of Senior Unsecured Notes             100,500,000     27,400,000                        
Loss from early extinguishment of debt $ 4,415,000 $ 4,415,000       $ 3,300,000     $ 1,100,000                          
[1] These notes were paid at maturity, primarily from borrowing on the Company’s unsecured revolving credit facility.
[2] On May 25, 2012, the Operating Partnership 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 103.191672 percent of the principal amount of the 2002 Notes, plus accrued and unpaid interest up to the redemption date. The Operating Partnership 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.
[3] On May 25, 2012, the Operating Partnership 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 103.868592 percent of the principal amount of the 2003 Notes, plus accrued and unpaid interest up to the redemption date. The Operating Partnership 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.
[4] Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable.