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Acquisitions of Real Estate Property (Details) (USD $)
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1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | |||||||||||
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May 31, 2012
property
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Dec. 31, 2012
property
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Aug. 31, 2012
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Apr. 02, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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May 12, 2011
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Dec. 31, 2012
Funds Previously Managed by LFREI
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Apr. 02, 2012
Cogdell Acquisition
property
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Dec. 31, 2012
Cogdell Acquisition
property
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Dec. 31, 2012
Development projects
property
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May 31, 2012
SUNRISE
property
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Dec. 31, 2011
Other Acquisitions
property
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Dec. 31, 2012
Other Acquisitions
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May 12, 2011
ASLG
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Oct. 31, 2011
ASLG
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May 31, 2011
ASLG
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Dec. 31, 2012
ATRIA
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Dec. 31, 2012
ATRIA
Funds Previously Managed by LFREI
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| Business acquisition | |||||||||||||||||||
| Ownership percentage | 34.00% | 34.00% | |||||||||||||||||
| Treasury stock, shares | 3,699,000 | 14,000 | 3,700,000 | ||||||||||||||||
| Consideration transferred | $ 760,000,000 | ||||||||||||||||||
| Preacquisition contingency, amount of settlement | 44,000,000 | ||||||||||||||||||
| Number of MOBs acquired and managed by property management business | 44 | ||||||||||||||||||
| Joint venture partners' share of total debt | 36,300,000 | 36,300,000 | |||||||||||||||||
| Right to receive cash per share on each outstanding share of common stock outstanding (in dollars per share) | $ 4.25 | ||||||||||||||||||
| Preferred stock, dividend rate, percentage | 8.50% | ||||||||||||||||||
| Consideration per share for each outstanding share of preferred stock (in dollars per share) | $ 25 | ||||||||||||||||||
| Mortgage debt assumed | 203,800,000 | ||||||||||||||||||
| Total acquisition-related cost | 28,600,000 | ||||||||||||||||||
| Business acquisition equity interests issued or issuable, number of shares issued | 24,958,543 | 24,958,543 | |||||||||||||||||
| Senior housing communities acquired | 21 | 2 | 16 | 5 | 117 | ||||||||||||||
| Number of skilled nursing facilities | 2 | ||||||||||||||||||
| Number of MOBs in which ownership interest acquired | 44 | 71 | 3 | ||||||||||||||||
| Net real estate property | 17,111,532,000 | 15,913,732,000 | 116,900,000 | ||||||||||||||||
| Value of common stock shares issued related to acquisition | 1,380,000,000 | ||||||||||||||||||
| Closing price on acquisition date used to value shares issued in the acquisition (in dollars per share) | $ 55.33 | ||||||||||||||||||
| Working capital adjustment, shares cancelled | 83,441 | ||||||||||||||||||
| Number of development land properties acquired | 1 | ||||||||||||||||||
| Fair values of the assets acquired and liabilities assumed at the date of acquisition | |||||||||||||||||||
| Land and improvements | 194,812,000 | 93,585,000 | 41,689,000 | 59,538,000 | 341,540,000 | ||||||||||||||
| Buildings and improvements | 1,721,060,000 | 626,302,000 | 311,888,000 | 782,870,000 | 2,876,717,000 | ||||||||||||||
| Construction in progress | 25,597,000 | 23,944,000 | 0 | 1,653,000 | |||||||||||||||
| Acquired lease intangibles | 202,799,000 | 117,132,000 | 14,320,000 | 71,347,000 | 159,610,000 | ||||||||||||||
| Other assets | 45,876,000 | 24,466,000 | 890,000 | 20,520,000 | 215,708,000 | ||||||||||||||
| Total assets acquired | 2,190,144,000 | 885,429,000 | 368,787,000 | 935,928,000 | 3,593,575,000 | ||||||||||||||
| Notes payable and other debt | 412,825,000 | 213,430,000 | 0 | 199,395,000 | 1,629,212,000 | ||||||||||||||
| Deferred tax liability | 43,466,000 | ||||||||||||||||||
| Other liabilities | 127,682,000 | 51,280,000 | 10,565,000 | 65,837,000 | 202,278,000 | ||||||||||||||
| Total liabilities assumed | 540,507,000 | 264,710,000 | 10,565,000 | 265,232,000 | 1,874,956,000 | ||||||||||||||
| Noncontrolling interest assumed (including redeemable interests) | 37,698,000 | 29,058,000 | 0 | 8,640,000 | |||||||||||||||
| Net assets acquired | 1,611,939,000 | 591,661,000 | 358,222,000 | 662,056,000 | 1,718,619,000 | ||||||||||||||
| Cash acquired | 24,871,000 | 12,202,000 | 0 | 12,669,000 | 77,718,000 | ||||||||||||||
| Business acquisition, equity issued | 1,376,437,000 | ||||||||||||||||||
| Total cash used | 1,587,068,000 | 350,000,000 | 579,459,000 | 358,222,000 | 329,500,000 | 649,387,000 | 264,464,000 | ||||||||||||
| Goodwill included in other assets | 399,000,000 | 80,500,000 | |||||||||||||||||
| Contingent consideration liabilities, Fair Value | $ 44,200,000 | ||||||||||||||||||
| Number of properties included in investments in unconsolidated entities | 36 | 6 | |||||||||||||||||