June 30,

2012

December 31,

2011

Effective

Rate (1)

5.250% Senior Unsecured Notes, due January 15, 2012 (2)

-

$

 99,988

5.457

%

6.150% Senior Unsecured Notes, due December 15, 2012 (3)

-

 94,438

6.894

%

5.820% Senior Unsecured Notes, due March 15, 2013 (4)

-

 25,972

6.448

%

4.600% Senior Unsecured Notes, due June 15, 2013

$

99,973

 99,958

4.742

%

5.125% Senior Unsecured Notes, due February 15, 2014

200,390

 200,509

5.110

%

5.125% Senior Unsecured Notes, due January 15, 2015

149,763

 149,717

5.297

%

5.800% Senior Unsecured Notes, due January 15, 2016

200,275

 200,313

5.806

%

7.750% Senior Unsecured Notes, due August 15, 2019

248,478

 248,372

8.017

%

4.500% Senior Unsecured Notes, due April 18, 2022

299,415

-

4.612

%

Total Senior Unsecured Notes

$

1,198,294

$

 1,119,267

(1)   Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable.

(2)   These notes were paid at maturity, primarily from borrowing on the Company’s unsecured revolving credit facility.

(3)   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.

(4)   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.