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Senior Living Community Management Agreements - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) community	Jun. 30, 2023 USD ($) community
Property operating expenses	$ 304,065	$ 286,228	$ 611,669	$ 572,308
Affiliated Entity | Five Star
Property management agreement expense	10,444	9,890	20,851	19,904
Related party transaction capitalized amount	449	575	858	1,452
Affiliated Entity | Five Star | Rehabilitation Services
Property operating expenses	0	334	10	1,213
Affiliated Entity | Five Star | Operating Expense
Property management agreement expense	9,995	9,315	$ 19,993	$ 18,452
Senior Living Communities | Affiliated Entity | Five Star
Number of communities managed | community			119	119
Senior Living Communities | Affiliated Entity | Third Party Managers
Number of communities managed | community			111	111
Property management agreement expense	5,758	$ 5,357	$ 11,483	$ 10,595
Termination and other fees	$ 1,826

X

- Definition

Represents the number of communities managed by a related party.

+ References

No definition available.

+ Details

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X

- Definition

Payments For Termination And Other Fees

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- Definition

Related Party Transaction Capitalized Amount

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No definition available.

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Balance Type:	debit
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X

- Definition

Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

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- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

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No definition available.

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Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=dhc_FiveStarQualityCareIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dhc_RehabilitationServicesMember
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
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- Details

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