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Leases (Details 3) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
Finance right-of-use assets | $ 41,660 |
Total right-of-use assets | 68,985 |
Property - operating lease liabilities | 16,686 |
Property - finance lease liabilities | 1,165 |
Total lease liabilities | 17,851 | $ 90,184
Properties |  |
Lessee, Lease, Description [Line Items] |  |
Property - operating right-of-use assets | 27,325 | 0
Finance right-of-use assets | 40,467 | 0
Property - operating lease liabilities | 16,686 | $ 0
Property - operating right-of-use assets | Properties |  |
Lessee, Lease, Description [Line Items] |  |
Property - operating right-of-use assets | 27,325 |
Property - finance right-of-use assets | Properties |  |
Lessee, Lease, Description [Line Items] |  |
Finance right-of-use assets | 40,467 |
Prepaid expenses and other assets, net | Vehicles and Office Equipment |  |
Lessee, Lease, Description [Line Items] |  |
Finance right-of-use assets | $ 1,193 |

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- Definition Lease Liabilities + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease, Right-of-Use Assets + References No definition available. + Details
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Namespace Prefix: | ofc_
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Balance Type: | debit
Period Type: | instant

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: 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 finance 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 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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- 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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