CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Real estate:
Land	$ 3,436,853	$ 3,262,616
Buildings and improvements	12,098,294	11,059,001
Furniture, fixtures and equipment	388,566	340,461
Total Capitalized Cost	15,923,713	14,662,078
Less accumulated depreciation	(2,799,679)	(2,476,729)
Net operating real estate	13,124,034	12,185,349
Construction in progress, including land	1,343,157	1,582,906
Land held for development	176,484	300,364
Operating real estate assets held for sale, net	80,624	215,590
Real Estate Investments, Net	14,724,299	14,284,209
Cash and cash equivalents	440,028	281,355
Cash in escrow	95,664	98,564
Resident security deposits	29,604	26,672
Investments in unconsolidated real estate entities	304,795	367,866
Deferred financing costs, net	39,329	40,677
Deferred development costs	36,945	31,592
Prepaid expenses and other assets	210,514	197,208
Total assets	15,881,178	15,328,143
LIABILITIES AND EQUITY
Unsecured notes, net	2,695,299	2,594,709
Variable rate unsecured credit facility	0	0
Mortgage notes payable	3,546,469	3,539,642
Dividends payable	153,125	138,476
Payables for construction	98,095	94,632
Accrued expenses and other liabilities	250,440	240,606
Accrued interest payable	28,857	43,175
Resident security deposits	49,425	44,823
Liabilities related to real estate assets held for sale	1,590	15,033
Total liabilities	6,823,300	6,711,096
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	12,596	17,320
Equity:
Preferred stock, $0.01 par value; $25 liquidation preference; 50,000,000 shares authorized at both September 30, 2014 and December 31, 2013; zero shares issued and outstanding at both September 30, 2014 and December 31, 2013	0	0
Common stock, $0.01 par value; 280,000,000 shares authorized at both September 30, 2014 and December 31, 2013; 132,006,835 and 129,416,695 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	1,320	1,294
Additional paid-in capital	9,344,198	8,988,723
Accumulated earnings less dividends	(256,162)	(345,254)
Accumulated other comprehensive loss	(44,074)	(48,631)
Total stockholders' equity	9,045,282	8,596,132
Noncontrolling interests	0	3,595
Total equity	9,045,282	8,599,727
Total liabilities and equity	$ 15,881,178	$ 15,328,143