CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 313,796		$ 111,570
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation expense	216,762	[1]	295,536	[1]
Depreciation expense from discontinued operations	0		10,619
Amortization of deferred financing costs	3,164		3,658
Amortization of debt premium	(17,554)		(12,048)
Loss on extinguishment of debt, net	412		0
Amortization of stock-based compensation	6,190		3,581
Equity in (income) loss of, and return on, unconsolidated real estate entities and noncontrolling interests, net of eliminations	(1,363)		22,310
Abandonment of development pursuits	1,455		0
Cash flow hedge losses reclassified to earnings	3,011		2,965
Gain on sale of real estate assets	(98,814)		(118,413)
Decrease (increase) in cash in operating escrows	3,489		(8,291)
Increase in resident security deposits, prepaid expenses and other assets	(8,094)		(46,464)
(Decrease) increase in accrued expenses, other liabilities and accrued interest payable	(12,743)		2,188
Net cash provided by operating activities	409,711		267,211
Cash flows from investing activities:
Development/redevelopment of real estate assets including land acquisitions and deferred development costs	(547,800)		(591,894)
Acquisition of real estate assets, including partnership interest	0		(749,275)
Capital expenditures - existing real estate assets	(20,617)		(1,986)
Capital expenditures - non-real estate assets	(5,187)		(2,721)
Proceeds from sale of real estate, net of selling costs	186,651		432,380
Mortgage note receivable repayment	21,748		0
Increase in payables for construction	1,389		31,307
Decrease (increase) in investments in unconsolidated real estate entities	52,300		(2,161)
Net cash used in investing activities	(311,516)		(884,350)
Cash flows from financing activities:
Issuance of common stock	214,970		2,605
Dividends paid	(288,610)		(249,267)
Net borrowings under unsecured credit facility	0		142,000
Issuance of mortgage notes payable	53,000		71,210
Repayments of mortgage notes payable, including prepayment penalties	(24,768)		(1,786,130)
Settlement of interest rate contract	0		(51,000)
Issuance of unsecured notes	250,000		0
Repayment of unsecured notes	(150,000)		(100,000)
Payment of deferred financing costs	(3,414)		(524)
Acquisition of joint venture partner equity interest	0		(1,965)
Distributions to DownREIT partnership unitholders	(17)		(16)
Distributions to joint venture and profit-sharing partners	(170)		(159)
Redemption of preferred interest obligation	(4,800)		(32,086)
Net cash provided by (used in) financing activities	46,191		(2,005,332)
Net increase (decrease) in cash and cash equivalents	144,386		(2,622,471)
Cash and cash equivalents, beginning of period	281,355		2,733,618
Cash and cash equivalents, end of period	425,741		111,147
Cash paid during the period for interest, net of amount capitalized	$ 94,343		$ 75,648

[1] Includes amounts associated with assets sold or held for sale, not classified as discontinued operations.