XML 30 R38.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Amortization of deferred financing fees |  |
Amortization expense in 2020 | $ 4,271 |
Amortization expense in 2021 | 3,791 |
Amortization expense in 2022 | 1,949 |
Amortization expense in 2023 | 1,632 |
Amortization expense in 2024 | 1,499 |
Amortization expense thereafter | 14,649 |
Unsecured Term Loans, Senior Notes, and Mortgage Notes Payable |  |
Debt Instrument [Line Items] |  |
Deb issuance costs, gross | 41,452 | $ 44,117
Accumulated amortization, debt issuance costs gross | 16,887 | 16,665
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Deb issuance costs, gross | 17,170 | 17,170
Accumulated amortization, debt issuance costs gross | $ 13,944 | $ 12,364

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

X
- Definition Represents the amount of amortization of deferred financing fees expected to be recognized after the fifth succeeding fiscal year. + References No definition available. + Details
Name: | dhc_DeferredFinanceCostsFutureAmortizationExpenseAfterYearFive
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of amortization of deferred financing fees expected to be recognized during year five of the five succeeding fiscal years. + References No definition available. + Details
Name: | dhc_DeferredFinanceCostsFutureAmortizationExpenseYearFive
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of amortization of deferred financing fees expected to be recognized during year four of the five succeeding fiscal years. + References No definition available. + Details
Name: | dhc_DeferredFinanceCostsFutureAmortizationExpenseYearFour
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of amortization of deferred financing fees expected to be recognized during year one of the five succeeding fiscal years. + References No definition available. + Details
Name: | dhc_DeferredFinanceCostsFutureAmortizationExpenseYearOne
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of amortization of deferred financing fees expected to be recognized during year three of the five succeeding fiscal years. + References No definition available. + Details
Name: | dhc_DeferredFinanceCostsFutureAmortizationExpenseYearThree
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of amortization of deferred financing fees expected to be recognized during year two of the five succeeding fiscal years. + References No definition available. + Details
Name: | dhc_DeferredFinanceCostsFutureAmortizationExpenseYearTwo
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of accumulated amortization of debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccumulatedAmortizationDeferredFinanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=dhc_UnsecuredTermLoansSeniorNotesandMortgageNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |