CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Real estate properties:
Land	$ 683,979us-gaap_Land	$ 623,756us-gaap_Land
Buildings and improvements	5,554,632	4,639,869
Total real estate properties, gross	6,238,611	5,263,625
Less accumulated depreciation	983,850	840,760
Total real estate properties, net	5,254,761us-gaap_RealEstateInvestmentPropertyNet	4,422,865us-gaap_RealEstateInvestmentPropertyNet
Cash and cash equivalents	27,594	39,233
Restricted cash	10,544us-gaap_ReplacementReserveEscrow	12,514us-gaap_ReplacementReserveEscrow
Investments in available for sale securities	23,993us-gaap_AvailableForSaleSecurities	29,078us-gaap_AvailableForSaleSecurities
Deferred financing fees, net	30,549us-gaap_DeferredFinanceCostsNet	27,975us-gaap_DeferredFinanceCostsNet
Due from affiliate	18,296us-gaap_DueFromRelatedParties	19,618us-gaap_DueFromRelatedParties
Acquired real estate leases and other intangible assets, net	472,788us-gaap_FiniteLivedIntangibleAssetsNet	103,494us-gaap_FiniteLivedIntangibleAssetsNet
Other assets	129,744us-gaap_OtherAssets	109,889us-gaap_OtherAssets
Total assets	5,968,269us-gaap_Assets	4,764,666us-gaap_Assets
LIABILITIES AND SHAREHOLDERS' EQUITY
Unsecured revolving credit facility	80,000us-gaap_LineOfCredit	100,000us-gaap_LineOfCredit
Unsecured term loan	350,000us-gaap_UnsecuredLongTermDebt
Senior unsecured notes, net of discount	1,743,628us-gaap_SeniorNotes	1,093,337us-gaap_SeniorNotes
Secured debt and capital leases	627,076	699,427
Accrued interest	20,046	15,839
Due to affiliate	11,675	11,876
Assumed real estate lease obligations, net	122,826snh_OffMarketLeaseUnfavorableNet	12,528snh_OffMarketLeaseUnfavorableNet
Other liabilities	60,611us-gaap_OtherLiabilities	54,670us-gaap_OtherLiabilities
Total liabilities	3,015,862us-gaap_Liabilities	1,987,677us-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	2,039us-gaap_CommonStockValue	1,881us-gaap_CommonStockValue
Additional paid in capital	3,825,063	3,497,590
Cumulative net income	1,353,622	1,194,985
Cumulative other comprehensive income	3,329	8,412
Cumulative distributions	(2,231,646)snh_CumulativeCommonStockDividends	(1,925,879)snh_CumulativeCommonStockDividends
Total shareholders' equity	2,952,407us-gaap_StockholdersEquity	2,776,989us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	$ 5,968,269	$ 4,764,666

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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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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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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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 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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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.

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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.

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