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v3.19.3.a.u2

Summary of Significant Accounting Policies - Real Estate Lease Obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Acquired real estate leases: |  |
Capitalized above market lease values | $ 34,587 | $ 35,056
Less: accumulated amortization | (30,039) | (27,375)
Capitalized above market lease values, net | 4,548 | 7,681
Lease, Net [Abstract] |  |
Lease origination value | 642,158 | 656,163
Less: accumulated amortization | (308,831) | (244,600)
Lease origination value, net | 333,327 | 411,563
Acquired real estate leases, net | 337,875 | 419,244
Assumed real estate lease obligations: |  |
Capitalized below market lease values | 134,225 | 134,395
Less: accumulated amortization | (57,520) | (48,091)
Assumed real estate lease obligations, net | $ 76,705 | $ 86,304

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