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Real Estate Properties (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended | 5 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended |  | 1 Months Ended | 5 Months Ended |  | 5 Months Ended | 1 Months Ended |  | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2011 property segment Y count state | Sep. 30, 2011 property segment Y count state | Sep. 30, 2010 property | Dec. 31, 2010 property | Sep. 30, 2011 Acquisition sqft agreement | Sep. 30, 2011 Acquisition | Aug. 31, 2011 Acquisition Five States in the southeastern United States Senior living communities property | Jul. 31, 2011 Acquisition Five States in the southeastern United States Senior living communities property | Jun. 30, 2011 Acquisition Five States in the southeastern United States Senior living communities property | May 31, 2011 Acquisition Five States in the southeastern United States Senior living communities property | Mar. 31, 2011 Acquisition Five States in the southeastern United States Senior living communities property state | Sep. 30, 2011 Acquisition Five States in the southeastern United States Senior living communities property | Jul. 31, 2011 Acquisition Alachua, Florida Medical Office Building property sqft | Sep. 30, 2011 Acquisition Six States Senior living communities state | Jul. 31, 2011 Acquisition Six States Senior living communities Five Star property | Sep. 30, 2011 Acquisition Six States Senior living communities Living units property | Sep. 30, 2011 Acquisition Six States Senior living communities TRS property | Sep. 30, 2011 Acquisition Senior living communities property | Jun. 30, 2011 Acquisition Senior living communities Five Star property | Sep. 30, 2011 Acquisition Medical Office Building property | Sep. 30, 2011 Acquisition Medical Office Building CommonWealth REIT (CWH) sqft property state | Aug. 31, 2011 Acquisition Land for future development acre | Jul. 31, 2011 Acquisition Land for future development | Sep. 30, 2011 Acquisition Assisted living community property | Sep. 30, 2011 Pennsylvania unit property | Sep. 30, 2011 Senior living communities property | Sep. 30, 2011 Medical Office Building property | Dec. 31, 2010 Medical Office Building property | Sep. 30, 2011 Five Star | Sep. 30, 2011 Five Star | Dec. 31, 2010 Five Star
Real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties owned | 357 | 357 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which properties are located | 37 | 37 |  |  |  |  |  |  |  |  | 5 |  |  | 6 |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |
Number of properties agreed to be acquired |  |  |  |  |  |  |  |  |  |  | 20 | 2 | 1 |  |  |  |  | 1 |  | 3 | 13 |  |  |  |  |  |  |  |  |  |
Aggregate purchase price of properties acquired, excluding closing costs |  |  |  |  | $ 43,725 | $ 569,893 | $ 17,158 | $ 44,671 | $ 196,594 |  | $ 304,000 |  | $ 5,200 | $ 478,000 |  |  |  |  |  |  | $ 167,000 | $ 4,000 |  |  |  |  |  | $ 433,955 |  |  |
Number of properties acquired |  |  |  |  |  |  | 1 | 3 | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 | 25 | 26 |  |  |
Mortgage loans assumed in real estate acquisition | 28,869 | (76,931) | (2,458) |  |  |  | 12,459 | 12,757 | 48,062 |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,653 |  |  |  |  |  |  |  |
Mortgage loans expected to be assumed in real estate acquisition |  |  |  |  | 9,700 | 9,700 |  |  |  |  |  |  |  | 164,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties classified as held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of units in real estate property held for sale | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103 |  |  |  |  |  |
Real estate properties, held for sale | 166 | 166 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 850 |  |  |  |  |  |
Number of acquisition agreements |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties agreed to be acquired, referred as managed properties |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties agreed to be acquired, referred as leased properties |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired, referred as managed properties |  |  |  |  |  |  | 1 | 2 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Number of units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,226 |  |  |  |  |  |  |  | 57 |  |  |  |  |  |  |
Area of real estate properties acquired (in square feet) |  |  |  |  | 138,606 |  |  |  |  |  |  |  | 32,476 |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |
Intangible lease assets recorded |  |  |  |  |  |  |  |  |  |  |  |  | 354 |  |  |  |  |  |  |  | 31,150 |  |  |  |  |  |  |  |  |  |
Intangible lease liabilities recorded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,919 |  |  |  |  |  |  |  |  |  |
Area of real estate property acquired (in acres) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47 |  |  |  |  |  |  |  |  |
Impairment of assets charges recorded | 1,028 | 1,194 | 1,095 | 5,965 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties impaired | 1 | 3 | 5 | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate improvements purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,554 | 25,877 | 31,894
Increase or decrease in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 845 | $ 2,073 |

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- Definition The number of acres of an acquired real estate property. + Details
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- Definition Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease. + Details
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- Definition The amount of debt the entity expects to assume in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. + Details
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- Definition Represents the number of agreements entered into by the entity to acquire senior living communities and MOBs. + Details
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- Definition Represents the units acquired by the borrower, funded through the mortgage loan. + Details
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- Definition Represents the number of properties acquired by the entity during the period, which are referred by the entity as managed properties. + Details
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- Definition Represents the number of properties agreed to be acquired by the entity under purchase and sales agreements during the period. + Details
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- Definition Represents the number of properties agreed to be acquired by the entity under purchase agreements, which are referred by the entity as leased properties. + Details
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- Definition Represents the number of properties agreed to be acquired by the entity under purchase agreements, which are referred by the entity as managed properties. + Details
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- Definition The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date. + Details
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- Definition Represents the number of real estate properties impaired. + Details
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- Definition The number of units in a real estate property classified as held for sale as of the balance sheet date. + Details
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- Definition This element represents the aggregate purchase price excluding closing costs, of real estate properties acquired by the entity during the period. + Details
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- Definition Represents the amount of improvements to real estate properties made by lessees and purchased by the entity. + Details
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- Definition Represents the intangible lease assets recorded as part of the real estate acquisition. + Details
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- Definition Represents the intangible lease liabilities recorded as part of the real estate acquisition. + Details
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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + Details
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Balance Type: | na
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- Definition The number of states the entity operates in as of the balance sheet date. + Details
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- Definition The number of units in a real estate property owned as of the balance sheet date. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of units (items of property) under operating lease arrangements. + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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- Definition The amount of square footage related to a real estate property. + Details
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