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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Operating Activities    
Net income/(loss) $ 242,934 $ (13,747)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:    
Depreciation and amortization 180,656 177,305
Net gain on sale of marketable securities 0 (3,123)
Net gain on the sale of depreciable property (252,531) (44,699)
Tax (benefit)/expense of taxable REIT subsidiary (25,694) 988
(Gain)/loss on debt extinguishment (285) 4,059
Write off of bad debt 1,498 1,241
Loss from unconsolidated entities 5,103 2,680
Amortization of deferred financing costs and other 4,787 4,238
Amortization of deferred compensation 7,049 5,105
Amortization of convertible debt discount 0 718
Changes in operating assets and liabilities:    
Increase in operating assets (240) (10,641)
(Increase)/decrease in operating liabilities (15,173) (9,049)
Net cash provided by operating activities 148,104 115,075
Investing Activities    
Proceeds from sales of real estate investments, net 594,680 29,363
Proceeds from sale of marketable securities 0 3,497
Acquisition of real estate assets (net of liabilities assumed) and initial capital expenditures (11,246) (109,148)
Cash paid in nonmonetary asset exchange. 0 (28,124)
Development of real estate assets (105,861) (44,547)
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement (66,983) (37,691)
Capital expenditures - non-real estate assets (1,721) (2,477)
Investment in unconsolidated joint ventures (297,127) (33,245)
Distributions received from unconsolidated joint venture 5,363 488
Issuance of note receivable (39,409) 0
Purchase deposits on pending real estate acquisitions 0 (44,176)
Net cash provided by/(used in) investing activities 77,696 (266,060)
Financing Activities    
Payments on secured debt (484,534) (204,896)
Proceeds from the issuance of secured debt 250 19,204
Proceeds from the issuance of unsecured debt 396,400 296,964
Payments on unsecured debt (100,000) (167,790)
Net proceeds/(repayment) of revolving bank debt (421,000) (26,750)
Payment of financing costs (4,342) (3,380)
Issuance of common and restricted stock, net (8,185) 3,832
Proceeds from the issuance of common shares through public offering, net 756,441 325,106
Payments from the repurchase of Series G preferred stock, net (81,609) (3,597)
Distributions paid to non-controlling interests (4,500) (2,952)
Distributions paid to preferred stockholders (5,713) (4,696)
Distributions paid to common stockholders (97,399) (67,912)
Net cash provided by/(used in) financing activities (54,191) 163,133
Net increase in cash and cash equivalents 171,609 12,148
Cash and cash equivalents, beginning of period 12,503 9,486
Cash and cash equivalents, end of period 184,112 21,634
Supplemental Information:    
Interest paid during the period, net of amounts capitalized 78,923 83,233
Non-cash transactions:    
Secured debt assumed in the acquisitions of properties, including asset exchange 34,412 247,805
Fair market value of secured debt assumed in acquisitions of properties, including asset exchange 2,617 21,915
Conversion of operating partnership non-controlling interests to common stock (4,453 shares in 2011 and 445,560 shares in 2010) 146 48
Real estate acquired in asset exchange 0 268,853
Real estate disposed in asset exchange 0 192,576
OP Units issued in partial consideration for property acquisition 0 62,878
Secured debt transferred in asset exchange $ 0 $ 55,356