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Selected Quarterly Financial Data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 5 Months Ended | 10 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 property | Oct. 31, 2014 property
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 229,809 us-gaap_Revenues | $ 216,873 us-gaap_Revenues | $ 206,708 us-gaap_Revenues | $ 191,497 us-gaap_Revenues | $ 200,336 us-gaap_Revenues | $ 187,265 us-gaap_Revenues | $ 186,928 us-gaap_Revenues | $ 186,909 us-gaap_Revenues | $ 844,887 us-gaap_Revenues | $ 761,438 us-gaap_Revenues | $ 634,800 us-gaap_Revenues |  |
Net income | 45,288 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 37,112 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 37,659 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 38,580 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 72,206 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 38,125 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 5,598 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 35,235 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 158,637 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 151,164 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 135,884 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |
Per share data: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.22 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.19 us-gaap_EarningsPerShareBasic | $ 0.21 us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.03 us-gaap_EarningsPerShareBasic | $ 0.19 us-gaap_EarningsPerShareBasic |  |  |  |  |
Common distributions declared (in dollars per share) | $ 0.39 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.39 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.39 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.39 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.39 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.39 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.39 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.39 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |  |
Impairment charge |  |  |  |  |  |  | 32,267 us-gaap_AssetImpairmentCharges |  | (10)us-gaap_AssetImpairmentCharges | 7,989 us-gaap_AssetImpairmentCharges | 3,071 us-gaap_AssetImpairmentCharges |  |
Selected quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  | 5,453 us-gaap_GainLossOnSaleOfProperties | 37,392 us-gaap_GainLossOnSaleOfProperties | (101)us-gaap_GainLossOnSaleOfProperties |  |
Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Selected quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties Sold |  |  |  |  |  |  |  |  |  |  |  | 3 snh_NumberOfPropertiesSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember | 6 snh_NumberOfPropertiesSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  |  |  | 37,392 us-gaap_GainLossOnSaleOfProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember | 5,452 us-gaap_GainLossOnSaleOfProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember
Rehabilitation hospitals | Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Selected quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties Sold |  |  |  |  |  |  |  |  |  | 2 snh_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_RehabilitationHospitalsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  | 2 snh_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_RehabilitationHospitalsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  | $ 36,251 us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_RehabilitationHospitalsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |  |

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