XML 60 R39.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Summary of Significant Accounting Policies - Leasing Costs and Revenue Recognition (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) community | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
DEFERRED LEASING COSTS |  |  |
Unamortized gross balance of deferred leasing costs | $ 42,014 | $ 35,145 |
Accumulated amortization | $ 14,922 | 11,422 |
Weighted average amortization period for deferred leasing cost | 13 years |  |
Expected amortization expense for the five years |  |  |
Expected amortization expense, 2020 | $ 5,013 |  |
Expected amortization expense, 2021 | 4,292 |  |
Expected amortization expense, 2022 | 3,469 |  |
Expected amortization expense, 2023 | 2,944 |  |
Expected amortization expense, 2024 | 2,473 |  |
Expected amortization expense, thereafter | 8,901 |  |
Percentage rents earned | $ 2,958 | $ 8,443 | $ 10,168
Senior Living Communities | Five Star |  |  |
Expected amortization expense for the five years |  |  |
Number of communities managed | community | 78 |  |

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

X
- Definition Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
Name: | dhc_DeferredCostsLeasingExpectedFutureAmortizationYearAfterYearFive
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
Name: | dhc_DeferredCostsLeasingExpectedFutureAmortizationYearFive
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
Name: | dhc_DeferredCostsLeasingExpectedFutureAmortizationYearFour
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
Name: | dhc_DeferredCostsLeasingExpectedFutureAmortizationYearOne
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
Name: | dhc_DeferredCostsLeasingExpectedFutureAmortizationYearThree
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
Name: | dhc_DeferredCostsLeasingExpectedFutureAmortizationYearTwo
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the weighted average amortization period for deferred leasing costs. + References No definition available. + Details
Name: | dhc_DeferredCostsLeasingWeightedAverageAmortizationPeriod
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of communities managed by a related party. + References No definition available. + Details
Name: | dhc_NumberOfCommunitiesManagedByRelatedParty
Namespace Prefix: | dhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Leases, Percentage Of Rents Earned + References No definition available. + Details
Name: | dhc_OperatingLeasesPercentageOfRentsEarned
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 + Details
Name: | us-gaap_DeferredCostsLeasingAccumulatedAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40246-112709 + Details
Name: | us-gaap_DeferredCostsLeasingGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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