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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Common Shares | Additional Paid-in Capital | Cumulative Net Income | Cumulative Distributions | Unrealized Gain (Loss) on Investments | Total
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Balance at Dec. 31, 2011 | $ 1,626 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 2,944,212 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 907,937 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (1,377,397)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = snh_CumulativeCommonDistributionsMember | $ (3,772)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 2,472,606 us-gaap_StockholdersEquity
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Comprehensive income |  |  | 135,884 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 8,334 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 144,218 us-gaap_ComprehensiveIncomeNetOfTax
Distributions |  |  |  | (259,537)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = snh_CumulativeCommonDistributionsMember |  | (259,537)us-gaap_DividendsCommonStock
Issuance of shares | 138 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 286,914 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 287,052 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of shares (in shares) | 13,800,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Share grants | 1 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,228 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 2,229 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
Share grants (in shares) | 107,554 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Balance at Dec. 31, 2012 | 1,765 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,233,354 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,043,821 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,636,934)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = snh_CumulativeCommonDistributionsMember | 4,562 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,646,568 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2012 | 176,553,600 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Comprehensive income |  |  | 151,164 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 3,850 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 155,014 us-gaap_ComprehensiveIncomeNetOfTax
Distributions |  |  |  | (288,945)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = snh_CumulativeCommonDistributionsMember |  | (288,945)us-gaap_DividendsCommonStock
Issuance of shares | 115 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 261,698 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 261,813 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of shares (in shares) | 11,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Share grants | 1 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,538 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 2,539 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
Share grants (in shares) | 114,043 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Balance at Dec. 31, 2013 | 1,881 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,497,590 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,194,985 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,925,879)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = snh_CumulativeCommonDistributionsMember | 8,412 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,776,989 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013 | 188,167,643 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 188,167,643 us-gaap_CommonStockSharesIssued
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Comprehensive income |  |  | 158,637 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (5,083)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 153,554 us-gaap_ComprehensiveIncomeNetOfTax
Distributions |  |  |  | (305,767)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = snh_CumulativeCommonDistributionsMember |  | (305,767)us-gaap_DividendsCommonStock
Issuance of shares | 156 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 325,455 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 325,611 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of shares (in shares) | 15,648,462 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Share grants | 2 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,018 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 2,020 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
Share grants (in shares) | 94,200 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Balance at Dec. 31, 2014 | $ 2,039 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 3,825,063 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,353,622 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (2,231,646)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = snh_CumulativeCommonDistributionsMember | $ 3,329 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 2,952,407 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 | 203,910,305 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 203,910,305 us-gaap_CommonStockSharesIssued

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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