CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Real estate:
Land	$ 780,156	$ 791,604
Construction in progress	163,534	83,241
Buildings, improvements and equipment	4,599,949	4,580,381
Real estate, gross	5,543,639	5,455,226
Less: accumulated depreciation	(1,213,528)	(1,108,840)
Real estate, net	4,330,111	4,346,386
Cash and cash equivalents	11,024	21,092
Cash in escrows	24,929	26,971
Accounts receivable, net	11,900	13,406
Prepaid expenses	22,973	19,504
Deferred charges, net	12,750	13,429
Other assets	7,198	10,704
Total assets	4,420,885	4,451,492
LIABILITIES AND EQUITY
Mortgage notes payable	1,879,090	2,165,027
Unsecured notes payable	450,000	450,000
Unsecured line of credit	106,500	162,500
Accounts payable	25,547	22,691
Accrued interest payable	10,754	9,974
Accrued expenses and other liabilities	31,703	33,887
Security deposits	18,531	19,146
Total liabilities	2,522,125	2,863,225
Commitments and contingencies
Equity:
Preferred stock, $0.01 par value; 10,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.01 par value; 80,000,000 shares authorized; 56,888,256 and 51,508,142 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	569	515
Excess stock, $0.01 par value; 10,000,000 shares authorized; no shares issued or outstanding
Additional paid-in capital	2,003,800	1,709,919
Distributions in excess of accumulated earnings	(397,179)	(388,397)
Accumulated other comprehensive income (loss)	395	(1,069)
Total common stockholders' equity	1,607,585	1,320,968
Noncontrolling interest	291,175	267,299
Total equity	1,898,760	1,588,267
Total liabilities and equity	$ 4,420,885	$ 4,451,492