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v2.4.1.9

Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Feb. 24, 2015 | Feb. 28, 2015 | Apr. 30, 2014 | Mar. 31, 2015 | Jun. 30, 2014 | Mar. 31, 2014 | Apr. 24, 2015 | Apr. 01, 2015
Distributions |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.39 us-gaap_CommonStockDividendsPerShareCashPaid |  |  |  |  |  |  |
Distributions to shareholders | $ (79,530)us-gaap_PaymentsOfDividendsCommonStock |  |  | $ (79,530)us-gaap_PaymentsOfDividendsCommonStock |  | $ (73,386)us-gaap_PaymentsOfDividendsCommonStock |  |
Common shares issued in public offering |  | 31,050,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 15,525,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  | 31,050,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |
Net proceeds after underwriting discounts from issuance of common shares issued in public offering |  | 659,750 us-gaap_ProceedsFromIssuanceOfCommonStock | 322,807 us-gaap_ProceedsFromIssuanceOfCommonStock | 659,750 us-gaap_ProceedsFromIssuanceOfCommonStock | 659,750 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |
Subsequent event |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) |  |  |  |  |  |  | $ 0.39 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Distributions to shareholders |  |  |  |  |  |  | $ (91,655)us-gaap_PaymentsOfDividendsCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Common shares awarded |  |  |  |  |  |  |  | 15,431 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
RMR |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |
Common shares issued in public offering |  |  |  | 39,467 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember |  |  |  |
Common shares awarded |  |  |  | 36,610 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember |  |  |  |

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