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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 363,261 $ 249,729 $ 269,360
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization (including amounts in discontinued operations) 459,704 206,064 201,258
Amortization of deferred revenue and lease intangibles, net (12,159) (1,764) (1,772)
Other non-cash amortization (13,163) 8,750 6,353
Change in fair value of financial instruments 2,959 0 0
Stock-based compensation 19,346 14,078 11,882
Straight-lining of rental income, net (14,885) (10,167) (11,879)
Loss on extinguishment of debt 27,604 9,791 6,080
Net gain on sale of real estate assets (including amounts in discontinued operations) 0 (25,241) (67,305)
Gain on real estate loan investments (3,255) (915) 0
Gain on sale of marketable securities (733) 0 0
Income tax (benefit) expense (31,137) 5,201 (1,719)
Loss from unconsolidated entities 52 664 0
Other 4,446 (46) (95)
Changes in operating assets and liabilities:      
Decrease (increase) in other assets 424 (8,245) (1,514)
(Decrease) increase in accrued interest (9,150) 1,311 (3,957)
(Decrease) increase in accounts payable and other liabilities (20,117) (1,588) 15,409
Net cash provided by operating activities 773,197 447,622 422,101
Cash flows from investing activities:      
Net investment in real estate property (531,605) (274,441) (45,715)
Purchase of noncontrolling interest (3,319) (42,333) 0
Investment in loans receivable (628,133) (38,725) (13,803)
Proceeds from real estate disposals 20,618 58,163 58,542
Proceeds from loans receivable 220,179 19,291 8,028
Proceeds from sale of marketable securities 23,050 0 0
Proceeds from sale of investments 0 0 5,000
Development project expenditures (47,591) (1,662) (2,732)
Capital expenditures (50,473) (18,193) (11,066)
Other (165) (4,020) 0
Net cash used in investing activities (997,439) (301,920) (1,746)
Cash flows from financing activities:      
Net change in borrowings under revolving credit facilities 537,452 28,564 (292,873)
Proceeds from debt 1,343,640 597,382 365,682
Repayment of debt (1,388,962) (524,760) (525,173)
Payment of deferred financing costs (20,040) (2,694) (16,655)
Issuance of common stock, net 299,847 0 299,201
Cash distribution to common stockholders (521,046) (336,085) (314,399)
Cash distribution to redeemable OP unitholders (2,359) 0 0
Purchases of redeemable OP units (185) 0 0
Contributions from noncontrolling interest 2 818 1,211
Distributions to noncontrolling interest (2,556) (8,082) (9,869)
Other 2,489 13,405 2,695
Net cash provided by (used in) financing activities 248,282 (231,452) (490,180)
Net increase (decrease) in cash and cash equivalents 24,040 (85,750) (69,825)
Effect of foreign currency translation on cash and cash equivalents (45) 165 410
Cash and cash equivalents at beginning of period 21,812 107,397 176,812
Cash and cash equivalents at end of period 45,807 21,812 107,397
Supplemental disclosure of cash flow information:      
Interest paid including swap payments and receipts 257,175 161,352 175,298
Assets and liabilities assumed from acquisitions:      
Real estate investments 10,973,093 125,846 67,781
Utilization of escrow funds held for an Internal Revenue Code Section 1031 exchange 0 0 (64,995)
Other assets acquired 594,176 (385) 0
Debt assumed 3,651,089 125,320 0
Other liabilities 952,279 141 62
Deferred income tax liability 43,889 0 0
Redeemable OP unitholder interests 100,888 0 0
Noncontrolling interests 81,192   2,724
Equity issued 6,737,932 0 0
Debt transferred on the sale of assets $ 0 $ 0 $ 38,759