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Leases Leases - (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | May 04, 2020 | Dec. 31, 2019
Lessee, Lease, Description [Line Items] |  |  |  |
Straight line rental income | $ 1,153 | $ 1,934 |  |
Straight line rental income, excluding properties held-for-sale | 103,340 | 99,297 |  |
Variable lease, payment | 20,028 | 18,845 |  |
Reimbursement revenue lease | 1,020 | $ 1,197 |  |
Operating lease, right-of-use asset | 4,299 |  |  | $ 4,319
Operating lease, liability | $ 4,449 |  |  | $ 4,461
Subsequent Event |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Deferred rent credit |  |  | $ 4,822 |

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- Definition Lessor, Deferred Rent Credit + References No definition available. + Details
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Namespace Prefix: | dhc_
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Balance Type: | credit
Period Type: | instant

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- Definition Reimbursement Revenue Lease + References No definition available. + Details
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Balance Type: | credit
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- Definition Straight Line Rent, Excluding Properties Held-for-Sale + References No definition available. + Details
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- 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
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Data Type: | xbrli:stringItemType
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Difference between actual rental income due and rental income recognized on a straight-line basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Amount of cash outflow for variable lease payment excluded from lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 + Details
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- Details
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