CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Real estate, at cost:
Land	$ 1,914,482	$ 1,749,378
Buildings and improvements	3,714,597	3,222,603
Total real estate, at cost	5,629,079	4,971,981
Less accumulated depreciation and amortization	(901,501)	(814,126)
Net real estate held for investment	4,727,578	4,157,855
Real estate held for sale, net	7,110	2,153
Net real estate	4,734,688	4,160,008
Cash and cash equivalents	2,794	4,165
Accounts receivable, net	17,187	15,375
Goodwill	17,010	17,206
Other assets, net	264,647	222,635
Total assets	5,036,326	4,419,389
LIABILITIES AND STOCKHOLDERS' EQUITY
Distributions payable	23,704	21,405
Accounts payable and accrued expenses	38,026	58,770
Other liabilities	39,499	29,179
Lines of credit payable	609,000	237,400
Mortgages payable, net	133,394	67,781
Notes payable	1,750,000	1,750,000
Total liabilities	2,593,623	2,164,535
Commitments and contingencies
Stockholders' equity:
Preferred stock and paid in capital, par value $0.01 per share, 69,900,000 shares authorized and 25,150,000 shares issued and outstanding as of September 30, 2012, and 20,000,000 shares authorized and 13,900,000 shares issued and outstanding as of December 31, 2011	609,363	337,790
Common stock and paid in capital, par value $0.01 per share, 370,100,000 shares authorized and 133,452,011 shares issued and outstanding as of September 30, 2012, and 200,000,000 shares authorized and 133,223,338 shares issued and outstanding as of December 31, 2011	2,569,871	2,563,048
Distributions in excess of net income	(736,531)	(645,984)
Total stockholders' equity	2,442,703	2,254,854
Total liabilities and stockholders' equity	$ 5,036,326	$ 4,419,389