CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income		$ 380,306	$ 313,796
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation expense	[1]	235,480	216,762
Amortization of deferred financing costs		3,379	3,164
Amortization of debt premium		(14,815)	(17,554)
Gains (Losses) on Extinguishment of Debt		(7,749)	412
Amortization of stock-based compensation		8,255	6,190
Equity in loss (income) of, and return on, unconsolidated entities and noncontrolling interests, net of eliminations		8,432	(1,363)
Casualty and Impairment Loss, Noncash		(17,303)	0
Noncash Project Abandonment Costs		0	1,455
Repayments of Unsecured Debt		0	(150,000)
Cash flow hedge losses reclassified to earnings		2,992	3,011
Gain on sale of real estate assets		(91,456)	(98,814)
(Increase) decrease in cash in operating escrows		(9,357)	3,489
Increase in resident security deposits, prepaid expenses and other assets		(3,439)	(8,094)
Decrease in accrued expenses, other liabilities and accrued interest payable		(2,823)	(12,743)
Net cash provided by operating activities		491,902	409,711
Cash flows from investing activities:
Development/redevelopment of real estate assets including land acquisitions and deferred development costs		(865,497)	(547,800)
Capital expenditures - existing real estate assets		(50,584)	(20,617)
Capital expenditures - non-real estate assets		(1,432)	(5,187)
Proceeds from sale of real estate, net of selling costs		135,841	186,651
Proceeds from Sale and Collection of Notes Receivable		0	21,748
Increase in payables for construction		7,126	1,389
Proceeds from Sale of Equity Method Investments		36,858	55,096
Payments to Acquire Businesses and Interest in Affiliates		(803)	(2,796)
Net cash used in investing activities		(694,349)	(311,516)
Proceeds from Insurance Settlement, Investing Activities		44,142	0
Cash flows from financing activities:
Issuance of common stock		97,326	214,970
Dividends paid		(318,240)	(288,610)
Issuance of mortgage notes payable		0	53,000
Repayments of mortgage notes payable, including prepayment penalties		(588,226)	(24,768)
Issuance of unsecured notes		574,066	250,000
Payment of deferred financing costs		(4,277)	(3,414)
Distributions to DownREIT partnership unitholders		(19)	(17)
Distributions to joint venture and profit-sharing partners		(187)	(170)
Redemption of preferred interest obligation		(2,330)	(4,800)
Net cash provided by (used in) financing activities		(241,887)	46,191
Net increase (decrease) in cash and cash equivalents		(444,334)	144,386
Cash and cash equivalents, beginning of period		509,460	281,355
Cash and cash equivalents, end of period		65,126	425,741
Cash paid during the period for interest, net of amount capitalized		$ 91,572	$ 94,343

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