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Summary of Significant Accounting Policies - Real Estate Lease Obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Acquired real estate leases: |  |
Capitalized above market lease values | $ 3,804 | $ 5,187
Less: accumulated amortization | (3,001) | (3,978)
Capitalized above market lease values, net | 803 | 1,209
Lease, Net |  |
Lease origination value | 88,569 | 107,171
Less: accumulated amortization | (55,424) | (63,029)
Lease origination value, net | 33,145 | 44,142
Acquired real estate leases and other intangible assets, net | 33,948 | 45,351
Assumed real estate lease obligations: |  |
Capitalized below market lease values | 2,340 | 3,685
Less: accumulated amortization | (1,872) | (2,567)
Assumed real estate lease obligations, net | $ 468 | $ 1,118

X
- Definition Above Market Lease, Accumulated Amortization + References No definition available. + Details
Name: | dhc_AboveMarketLeaseAccumulatedAmortization
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Above Market Lease, Gross + References No definition available. + Details
Name: | dhc_AboveMarketLeaseGross
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Above Market Lease, Net + References No definition available. + Details
Name: | dhc_AboveMarketLeaseNet
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Above Market Lease, Net [Abstract] + References No definition available. + Details
Name: | dhc_AboveMarketLeaseNetAbstract
Namespace Prefix: | dhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lease, Accumulated Amortization + References No definition available. + Details
Name: | dhc_LeaseAccumulatedAmortization
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lease, Gross + References No definition available. + Details
Name: | dhc_LeaseGross
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lease, Net + References No definition available. + Details
Name: | dhc_LeaseNet
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lease, Net [Abstract] + References No definition available. + Details
Name: | dhc_LeaseNetAbstract
Namespace Prefix: | dhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Real Estate Leases, Net + References No definition available. + Details
Name: | dhc_RealEstateLeasesNet
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accumulated amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
Name: | us-gaap_BelowMarketLeaseAccumulatedAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
Name: | us-gaap_BelowMarketLeaseGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
Name: | us-gaap_BelowMarketLeaseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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