CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Real estate, at cost:
Land	$ 1,999,820	$ 1,749,378
Buildings and improvements	3,920,865	3,222,603
Total real estate, at cost	5,920,685	4,971,981
Less accumulated depreciation and amortization	(897,767)	(814,126)
Net real estate held for investment	5,022,918	4,157,855
Real estate held for sale, net	19,219	2,153
Net real estate	5,042,137	4,160,008
Cash and cash equivalents	5,248	4,165
Accounts receivable, net	21,659	15,375
Goodwill	16,945	17,206
Other assets, net	357,374	222,635
Total assets	5,443,363	4,419,389
LIABILITIES AND STOCKHOLDERS' EQUITY
Distributions payable	23,745	21,405
Accounts payable and accrued expenses	70,426	58,770
Other liabilities, net	52,530	29,179
Lines of credit payable	158,000	237,400
Mortgages payable, net	175,868	67,781
Notes payable	2,550,000	1,750,000
Total liabilities	3,030,569	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 December 31, 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 133,452,411 shares issued and outstanding as of December 31, 2012, and 200,000,000 shares authorized and 133,223,338 shares issued and outstanding as of December 31, 2011	2,572,092	2,563,048
Distributions in excess of net income	(768,661)	(645,984)
Total stockholders' equity	2,412,794	2,254,854
Total liabilities and stockholders' equity	$ 5,443,363	$ 4,419,389