XML 43 R31.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Fair Value of Assets and Liabilities - Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Recurring Fair Value Measurements |  |  |  |
Unrealized gains and losses on equity securities, net | $ 35,137 | $ 0 | $ 85,643 | $ 0
Impairment of assets | $ 4,525 | $ 0 | $ 5,073 | 5,082
Five Star |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Equity securities investment (in shares) | 4,235,000 |  | 4,235,000 |
Recurring | RMR Inc |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Investments in affiliates, fair value | $ 244,751 |  | $ 244,751 |
Recurring | Five Star |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Investments in affiliates, fair value | 3,643 |  | 3,643 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | RMR Inc |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Investments in affiliates, fair value | 244,751 |  | 244,751 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Five Star |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Investments in affiliates, fair value | 3,643 |  | 3,643 |
Recurring | Significant Other Observable Inputs (Level 2) | RMR Inc |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Investments in affiliates, fair value | 0 |  | 0 |
Recurring | Significant Other Observable Inputs (Level 2) | Five Star |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Investments in affiliates, fair value | 0 |  | 0 |
Recurring | Significant Unobservable Inputs (Level 3) | RMR Inc |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Investments in affiliates, fair value | 0 |  | 0 |
Recurring | Significant Unobservable Inputs (Level 3) | Five Star |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Investments in affiliates, fair value | $ 0 |  | $ 0 |
Class A common shares | RMR Inc |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Equity securities investment (in shares) | 2,637,408 |  | 2,637,408 |
Investment, original cost | $ 69,826 |  | $ 69,826 |
Unrealized gains and losses on equity securities, net | $ 37,847 |  | $ 88,353 |
Common Shares | Five Star |  |  |  |
Recurring Fair Value Measurements |  |  |  |
Equity securities investment (in shares) | 4,235,000 |  | 4,235,000 |
Investment, original cost | $ 6,353 |  | $ 6,353 |
Unrealized gains and losses on equity securities, net | $ (2,710) |  | $ (2,710) |
Impairment of assets |  |  |  | $ 5,082

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Original amount of cost-method investments at the acquisition date. + References No definition available. + Details
Name: | us-gaap_CostMethodInvestmentsOriginalCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Balance held at close of period in number of shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 + Details
Name: | us-gaap_InvestmentOwnedBalanceShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
Name: | us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_MarketableSecuritiesUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=snh_FiveStarQualityCareIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=snh_ReitManagementAndResearchIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |