CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Real estate properties:
Land	$ 742,763us-gaap_Land	$ 683,979us-gaap_Land
Buildings and improvements	5,975,183	5,554,632
Total real estate properties, gross	6,717,946	6,238,611
Less accumulated depreciation	(1,023,843)	(983,850)
Total real estate properties, net	5,694,103us-gaap_RealEstateInvestmentPropertyNet	5,254,761us-gaap_RealEstateInvestmentPropertyNet
Cash and cash equivalents	77,794	27,594
Restricted cash	7,685us-gaap_ReplacementReserveEscrow	10,544us-gaap_ReplacementReserveEscrow
Deferred financing fees, net	29,649us-gaap_DeferredFinanceCostsNet	30,549us-gaap_DeferredFinanceCostsNet
Acquired real estate leases and other intangible assets, net	543,776us-gaap_FiniteLivedIntangibleAssetsNet	472,788us-gaap_FiniteLivedIntangibleAssetsNet
Other assets	184,088us-gaap_OtherAssets	172,033us-gaap_OtherAssets
Total assets	6,537,095us-gaap_Assets	5,968,269us-gaap_Assets
LIABILITIES AND SHAREHOLDERS' EQUITY
Unsecured revolving credit facility		80,000us-gaap_LineOfCredit
Unsecured term loan	350,000us-gaap_UnsecuredLongTermDebt	350,000us-gaap_UnsecuredLongTermDebt
Senior Notes	1,743,983us-gaap_SeniorNotes	1,743,628us-gaap_SeniorNotes
Secured debt and capital leases	625,131	627,076
Accrued interest	31,984	20,046
Assumed real estate lease obligations, net	123,435snh_OffMarketLeaseUnfavorableNet	122,826snh_OffMarketLeaseUnfavorableNet
Other liabilities	87,769us-gaap_OtherLiabilities	72,286us-gaap_OtherLiabilities
Total liabilities	2,962,302us-gaap_Liabilities	3,015,862us-gaap_Liabilities
Shareholders' equity:
Common shares of beneficial interest, $.01 par value: 220,000,000 shares authorized, 203,910,305 and 188,167,643 shares issued and outstanding at December 31, 2014 and 2013, respectively	2,350us-gaap_CommonStockValue	2,039us-gaap_CommonStockValue
Additional paid in capital	4,485,386	3,825,063
Cumulative net income	1,393,410	1,353,622
Cumulative other comprehensive income	4,823	3,329
Cumulative distributions	(2,311,176)snh_CumulativeCommonStockDividends	(2,231,646)snh_CumulativeCommonStockDividends
Total shareholders' equity	3,574,793us-gaap_StockholdersEquity	2,952,407us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	$ 6,537,095	$ 5,968,269

The amount as of the balance sheet date representing cumulative distributions to common shareholders.

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Aggregate of the carrying amounts as of the balance sheet date of investments in buildings, improvements, construction in progress and equipment.

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This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition, less accumulated amortization and any impairment charges.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower and amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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This element represents those amounts set aside for the repair and replacement of real or personal property in the foreseen future. Such amount may be funded from sales revenue (for example; timeshare sales) or operating revenues; in a lump sum or installments (such as monthly); as per internal policy (for example: hotel operators), as required by contractual agreement (for example: sales contract); or by the terms of debt agreements.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 4.E)

-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section E

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29-31)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Details

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Period Type:	duration

- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

+ Details

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