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v2.4.1.9

Shareholders' Equity (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 2 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2015 | Apr. 30, 2014 | Jan. 31, 2013 | Jul. 31, 2012 | Dec. 31, 2014 property | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 24, 2015 | Jan. 12, 2015
Distributions |  |  |  |  |  |  |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.39 us-gaap_DividendsPayableAmountPerShare
Distribution declared to common shareholders |  |  |  |  |  |  |  |  | $ 79,530 us-gaap_DividendsPayableCurrentAndNoncurrent
Distribution to common shareholders (in dollars per share) |  |  |  |  | $ 1.56 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.56 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.53 us-gaap_CommonStockDividendsPerShareCashPaid |  |
Dividend distributions as percentage of ordinary income |  |  |  |  | 54.00%snh_CommonStockDividendsOrdinaryIncomeDistributionPercentage | 66.19%snh_CommonStockDividendsOrdinaryIncomeDistributionPercentage | 62.65%snh_CommonStockDividendsOrdinaryIncomeDistributionPercentage |  |
Dividend distributions as percentage of return of capital |  |  |  |  | 46.00%snh_CommonStockDividendsReturnOfCapitalDistributionPercentage | 21.30%snh_CommonStockDividendsReturnOfCapitalDistributionPercentage | 37.35%snh_CommonStockDividendsReturnOfCapitalDistributionPercentage |  |
Dividend distributions as percentage of capital gain |  |  |  |  | 0.00%snh_CommonStockDividendsCapitalGainDistributionPercentage | 3.10%snh_CommonStockDividendsCapitalGainDistributionPercentage | 0.00%snh_CommonStockDividendsCapitalGainDistributionPercentage |  |
Dividend distributions as percentage of unrecaptured Section 1250 gain |  |  |  |  | 0.00%snh_CommonStockDividendsUnrecapturedSection1250GainDistributionPercentage | 9.41%snh_CommonStockDividendsUnrecapturedSection1250GainDistributionPercentage | 0.00%snh_CommonStockDividendsUnrecapturedSection1250GainDistributionPercentage |  |
Common shares issued in public offering | 31,050,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 15,525,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 11,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 13,800,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |
Net proceeds after underwriting discounts from issuance of common shares issued in public offering | $ 660,014 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 322,807 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 261,813 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 287,052 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 322,807 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 261,813 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 287,052 us-gaap_ProceedsFromIssuanceOfCommonStock |  |
Number of properties pending acquisition |  |  |  |  | 38 snh_NumberOfPropertiesPendingAcquisition |  |  |  |
RMR |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |
Common shares issued in public offering |  |  |  |  | 123,462 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember | 21,968 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember | 20,462 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember |  |
RMR | Subsequent event |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |
Common shares issued in public offering |  |  |  |  |  |  |  | 25,263 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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