Consolidated Balance Sheets (USD $)	Mar. 31, 2012	Dec. 31, 2011
ASSETS
Real estate investments, net	$ 1,973,458,000	$ 1,806,471,000
Real estate notes receivable, net	57,431,000	57,459,000
Cash and cash equivalents	35,120,000	69,491,000
Accounts and other receivables, net	12,388,000	12,658,000
Restricted cash and escrow deposits	17,927,000	16,718,000
Identified intangible assets, net	296,731,000	272,390,000
Other assets, net	64,541,000	56,442,000
Total assets	2,457,596,000	2,291,629,000
Liabilities:
Mortgage and secured real estate term loans payable, net	636,466,000	639,149,000
Term loan	200,000,000	0
Accounts payable and accrued liabilities	43,244,000	47,801,000
Derivative financial instruments--interest rate swaps	2,270,000	1,792,000
Security deposits, prepaid rent and other liabilities	23,270,000	19,930,000
Identified intangible liabilities, net	12,899,000	11,832,000
Total liabilities	918,149,000	720,504,000
Commitments and contingencies (Note 12)
Redeemable noncontrolling interest of limited partners (Note 13)	3,690,000	3,785,000
Stockholders' Equity:
Preferred stock, $0.01 par value; 200,000,000 shares authorized; none issued and outstanding	0	0
Common stock, $0.01 par value; 1,000,000,000 shares authorized; 229,514,049 and 228,491,312 shares issued and outstanding as of March 31, 2012 and December 31, 2011, respectively	2,295,000	2,284,000
Additional paid-in capital	2,042,528,000	2,032,305,000
Accumulated deficit	(509,066,000)	(467,249,000)
Total stockholders' equity	1,535,757,000	1,567,340,000
Total liabilities and equity	$ 2,457,596,000	$ 2,291,629,000