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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 423,562 $ 441,370 $ 174,079
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation expense 256,026 239,060 220,563
Depreciation expense from discontinued operations 4,068 11,209 12,379
Amortization of deferred financing costs and debt premium/discount 6,427 5,834 7,723
Amortization of stock-based compensation 8,707 7,244 5,938
Cash flow hedge losses reclassified to earnings 1,889    
Equity in (income) loss of, and return on unconsolidated entities and noncontrolling interests, net of eliminations (12,103) 2,246 1,852
Loss on extinguishment of debt, net 1,781 5,820  
Casualty loss and impairment of real estate assets 1,449 14,052  
Gain on sale of real estate assets (146,591) (294,806) (74,074)
Gain on acquisition of unconsolidated entity (14,194)    
Expensed acquisition costs 9,593 1,010  
(Increase) decrease in cash in operating escrows 6,543 (7,702) (4,996)
Increase in resident security deposits, prepaid expenses and other assets (1,601) (5,028) (15,234)
(Decrease) increase in accrued expenses, other liabilities and accrued interest payable (4,737) 9,045 3,876
Net cash provided by operating activities 540,819 429,354 332,106
Cash flows from investing activities:      
Development/redevelopment of real estate assets including land acquisitions and deferred development costs (755,363) (640,778) (429,853)
Acquisition of real estate assets, including partnership interest (155,755) (46,275)  
Capital expenditures - existing real estate assets (23,452) (41,851) (16,772)
Capital expenditures - non-real estate assets (3,076) (8,281) (420)
Proceeds from exchange/sale of real estate, net of selling costs 274,018 310,228 194,009
Increase (decrease) in payables for construction 16,832 2,342 (15,190)
Decrease in cash in construction escrows 16,824 14,109 42,329
Acquisition of mortgage note   (1,701) (24,000)
Decrease (increase) in investments in unconsolidated real estate entities 6,586 (30,934) (49,039)
Net cash used in investing activities (623,386) (443,141) (298,936)
Cash flows from financing activities:      
Issuance of common stock 2,430,190 1,049,835 381,365
Dividends paid (365,572) (318,231) (298,090)
Repayments of mortgage notes payable (110,013) (200,166) (69,327)
Issuance of unsecured notes 700,000   250,000
Settlement of interest rate contract (54,930)    
Repayment of unsecured notes (381,001) (189,900) (89,576)
Payment of deferred financing costs and issuance discounts (15,664) (5,996) (6,524)
Redemption of units for cash by minority partners   (25)  
Acquisition of joint venture partner equity interest (3,350) (9,070)  
Distributions to DownREIT partnership unitholders (29) (20) (61)
Distributions to joint venture and profit-sharing partners (299) (194) (222)
Net cash provided by financing activities 2,199,332 326,233 167,565
Net increase in cash and cash equivalents 2,116,765 312,446 200,735
Cash and cash equivalents, beginning of year 616,853 304,407 103,672
Cash and cash equivalents, end of year 2,733,618 616,853 304,407
Cash paid during the year for interest, net of amount capitalized $ 119,268 $ 156,898 $ 157,014