XML 75 R57.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Business and Property Management Agreements with RMR LLC (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 23, 2021 | Dec. 31, 2021 USD ($) employee | Dec. 31, 2021 USD ($) employee lease agreement | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2017
Related Party Transaction |  |  |  |  |  |
Number of employees | employee |  | 0 | 0 |  |  |
Professional fees |  |  | $ 13,161,000 | $ 13,805,000 | $ 13,373,000 |
Seaport Innovation LLC | Joint Venture |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Additional equity joint venture percentage | 35.00% | 35.00% |  |  |  |
Equity method investment ownership percentage | 20.00% | 20.00% | 20.00% |  |  | 55.00%
RMR LLC |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Business management fees incurred |  |  | $ 23,378,000 | 20,629,000 | 27,399,000 |
Recognized amortization of the liability |  |  | $ 2,974,000 | 2,974,000 | 2,974,000 |
Management agreement fee payments |  |  |  |  | 40,642,000 |
Percentage of property management fees payable |  |  | 3.00% |  |  |
Construction supervision fees payable under property management agreement as a percentage of construction costs |  | 5.00% | 5.00% |  |  |
Property management and construction supervision fees |  |  | $ 12,504,000 | 13,802,000 | 13,141,000 |
Amortization of liability related to property management and construction supervision fees |  |  | 797,000 | 797,000 | 797,000 |
Party transaction property management and construction supervision fees capitalized |  | $ 2,820,000 | $ 2,820,000 | 3,718,000 | 2,436,000 |
Period over which transition services will be provided by the related party after termination of the agreement |  |  | 120 days |  |  |
RMR LLC | Operating Expense |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Property management and construction supervision fees |  |  | $ 9,684,000 | $ 10,084,000 | $ 10,705,000 |
RMR LLC | Senior Living Communities |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Number of consecutive renewal terms of agreement | agreement |  |  | 2 |  |  |
RMR LLC | Amended Agreement |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Base management fee payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments exceeding specified amount |  | 0.50% | 0.50% |  |  |
Base management fee payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments up to specified amount |  | 0.70% | 0.70% |  |  |
Threshold amount of other real estate investments for payment of base management fee |  | $ 250,000,000 | $ 250,000,000 |  |  |
Base management fee payable as a percentage of average market capitalization exceeding specified amount |  | 0.50% | 0.50% |  |  |
Threshold amount of average market capitalization for payment of base management fee |  | $ 250,000,000 | $ 250,000,000 |  |  |
Base management fee payable as a percentage of average closing price per share of common shares on NYSE |  | 0.70% | 0.70% |  |  |
Base management fee payable as a percentage of aggregate book value of real estate assets or transferred assets |  | 0.50% | 0.50% |  |  |
Incentive management fee payable (as a percent) |  | 12.00% | 12.00% |  |  |
Period of measurement |  |  | 3 years |  |  |
Top consecutive trading days |  |  | 10 days |  |  |
Consecutive trading days |  |  | 30 days |  |  |
Management agreement incentive fee payable |  | $ 0 | $ 0 |  |  |
Incentive management fee cap on common shares |  | 1.50% | 1.50% |  |  |
RMR LLC | Amended Agreement | Up C Transaction |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Number of business days notice for termination of property management agreement for convenience by the related party |  |  | 60 days |  |  |
Window for providing notice of termination of property management agreement for performance by the related party |  |  | 60 days |  |  |
Window for providing notice of termination of property management agreement for change of control by the related party |  |  | 12 months |  |  |
Number of terminated management agreements for convenience before termination fee is incurred | lease |  |  | 1 |  |  |
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred | lease |  |  | 1 |  |  |
Number of terminated management agreements for a performance reason before termination fee is incurred | lease |  |  | 1 |  |  |
Termination fee remaining term assumption |  |  | 10 years |  |  |
RMR LLC | Maximum |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Threshold amount of real estate investments for payment of base management fee |  | $ 250,000,000 | $ 250,000,000 |  |  |
Base management fee payable, average market capitalization |  | $ 250,000,000 | $ 250,000,000 |  |  |
RMR LLC | Maximum | Amended Agreement | Up C Transaction |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Termination fee term |  |  | 20 years |  |  |
RMR LLC | Minimum | Amended Agreement | Up C Transaction |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Termination fee term |  |  | 19 years |  |  |
RMR LLC | SNL US REIT Healthcare Index | Maximum | Amended Agreement |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Incentive management fee reduction, basis spread |  |  | 5.00% |  |  |
RMR LLC | SNL US REIT Healthcare Index | Minimum | Amended Agreement |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Incentive management fee reduction, basis spread |  |  | 2.00% |  |  |

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amortization Of Liability Related To Property Management And Construction Supervision Fees + References No definition available. + Details
Name: | dhc_AmortizationOfLiabilityRelatedToPropertyManagementAndConstructionSupervisionFees
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the base management fee payable as a percentage of average closing price per share of common shares on NYSE. + References No definition available. + Details
Name: | dhc_BaseManagementFeePayableAsPercentageOfAverageClosingStockPriceOnStockExchange
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the base management fees payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments exceeding specified amount. + References No definition available. + Details
Name: | dhc_BaseManagementFeePayableAsPercentageOfAverageHistoricalCostOfRealEstateInvestmentsExcludingTransferredAssetsForInvestmentsExceedingSpecifiedAmount
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the base management fees payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments up to specified amount. + References No definition available. + Details
Name: | dhc_BaseManagementFeePayableAsPercentageOfAverageHistoricalCostOfRealEstateInvestmentsExcludingTransferredAssetsForInvestmentsUpToSpecifiedAmount
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the base management fee payable as a percentage of average market capitalization exceeding specified amount. + References No definition available. + Details
Name: | dhc_BaseManagementFeePayableAsPercentageOfAverageMarketCapitalizationExceedingSpecifiedAmount
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of average market capitalization for payment of base management fee. + References No definition available. + Details
Name: | dhc_BaseManagementFeePayableAverageMarketCapitalization
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the threshold amount of average market capitalization for payment of the base management fee. + References No definition available. + Details
Name: | dhc_BaseManagementFeePayableThresholdAmountOfAverageMarketCapitalization
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the threshold amount of other real estate investments for payment of base management fee. + References No definition available. + Details
Name: | dhc_BaseManagementFeePayableThresholdAmountOfOtherRealEstateInvestments
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the threshold amount of real estate investments for payment of base management fee. + References No definition available. + Details
Name: | dhc_BaseManagementFeePayableThresholdAmountOfRealEstateInvestments
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the incentive fee payable to related parties under the business management agreement. + References No definition available. + Details
Name: | dhc_BusinessManagementAgreementIncentiveFeePayable
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Management Agreement Incentive Fee Payments + References No definition available. + Details
Name: | dhc_BusinessManagementAgreementIncentiveFeePayments
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the business management fees incurred pursuant to business management agreement with related parties. + References No definition available. + Details
Name: | dhc_BusinessManagementFees
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Incentive Management Fee Cap on Common Shares + References No definition available. + Details
Name: | dhc_IncentiveManagementFeeCapOnCommonShares
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Incentive Management Fee, Consecutive Trading Days + References No definition available. + Details
Name: | dhc_IncentiveManagementFeeConsecutiveTradingDays
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Incentive Management Fee Reduction, Total Return , Basis Spread + References No definition available. + Details
Name: | dhc_IncentiveManagementFeeReductionTotalReturnBasisSpread
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Incentive Management Fee, Top Consecutive Trading Days + References No definition available. + Details
Name: | dhc_IncentiveManagementFeeTopConsecutiveTradingDays
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the construction supervision fees payable to related parties under property management agreement expressed as a percentage of construction costs. + References No definition available. + Details
Name: | dhc_ManagementAgreementConstructionSupervisionFeesAsPercentageOfConstructionCosts
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the window or numbers of business days after any calendar year to provide notice for termination of property management agreement by the related party for performance reasons. + References No definition available. + Details
Name: | dhc_NumberOfBusinessDayWindowAfterEndOfAnyCalendarYearPriorWrittenNoticeForTerminationOfPropertyManagementAgreementForPerformanceByRelatedParty
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of business days notice for termination of property management agreement by the related party for convenience. + References No definition available. + Details
Name: | dhc_NumberOfBusinessDaysPriorWrittenNoticeForTerminationOfPropertyManagementAgreementForConvenienceByRelatedParty
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of management agreements the company would need to terminate for convenience before a termination fee is incurred. + References No definition available. + Details
Name: | dhc_NumberOfManagementAgreementsTerminatedBeforeTerminationFeeIncurred
Namespace Prefix: | dhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of management agreements RMR LLC would need to terminate for good cause before a termination fee is incurred. + References No definition available. + Details
Name: | dhc_NumberOfManagementAgreementsTerminatedGoodCauseBeforeTerminationFeeIncurred
Namespace Prefix: | dhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of management agreements the company would need to terminate for a performance reason before a termination fee is incurred. + References No definition available. + Details
Name: | dhc_NumberOfManagementAgreementsTerminatedPerformanceBeforeTerminationFeeIncurred
Namespace Prefix: | dhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the base management fees payable as a percentage of aggregate book value of real estate assets or transferred assets. + References No definition available. + Details
Name: | dhc_PercentageAppliedOnAverageHistoricalCostOfRealEstateInvestmentPropertiesAcquiredToCalculateBaseManagementFee
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the incentive management fee payable as a percentage of the product of the entity's equity market capitalization and its share price appreciation plus dividends. + References No definition available. + Details
Name: | dhc_PercentageForLimitationAndAdjustmentsOfIncentiveManagementFeePayable
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Equity Method Investment Sold + References No definition available. + Details
Name: | dhc_PercentageOfEquityMethodInvestmentSold
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Property Management Fees Payable Of Gross Collected Rent + References No definition available. + Details
Name: | dhc_PercentageOfPropertyManagementFeesPayableOfGrossCollectedRent
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the measurement periods ending with the year for which the incentive management fee is being calculated. + References No definition available. + Details
Name: | dhc_PeriodOfMeasurement
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period over which the related party agrees to provide certain transition services following an applicable termination of the agreement. + References No definition available. + Details
Name: | dhc_PeriodOfTransitionServicesProvidedByRelatedPartyAfterTerminationOfAgreement
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of consecutive renewal terms of agreement that the entity has the option to renew. + References No definition available. + Details
Name: | dhc_PropertyManagementAgreementNumberOfConsecutiveRenewalTerms
Namespace Prefix: | dhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties. + References No definition available. + Details
Name: | dhc_PropertyManagementAndConstructionSupervisionFees
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Property Management and Construction Supervision Fees, Capitalized + References No definition available. + Details
Name: | dhc_PropertyManagementAndConstructionSupervisionFeesCapitalized
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the remaining term assumption in years used to calculate the fee for termination of one or both of the company's amended management agreements for a performance reason. + References No definition available. + Details
Name: | dhc_TerminationFeeRemainingTermAssumption
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the term in years used to calculate the fee for termination of one or both of the company's amended management agreements for a performance reason. + References No definition available. + Details
Name: | dhc_TerminationFeeTerm
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of amortization of the liability recorded during the period. + References No definition available. + Details
Name: | dhc_TransactionAmortizationOfLiability
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the window after a change in control to provide notice for termination of property management agreement by the related party. + References No definition available. + Details
Name: | dhc_WindowAfterChangeOfControlPriorWrittenNoticeForTerminationOfPropertyManagementAgreementByRelatedParty
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.2(a),(b),(c),(d)) -URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section 45 -Paragraph 3 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=124433917&loc=SL114874205-224268 + Details
Name: | us-gaap_ProfessionalFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=dhc_SeaportInnovationLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_CounterpartyNameAxis=dhc_ReitManagementAndResearchLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OperatingExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=dhc_SeniorLivingCommunityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TransactionTypeAxis=dhc_AmendedAndRestateBusinessManagementAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=dhc_UpCTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=dhc_SNLUSREITHealthcareIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |