$CDP
COPT Defense Properties Stock $cdp

$cdp Overview Financials Valuation SEC Filings Company Website

2020 Q2 Form 10-Q Financial Statement

#000086054620000029 Filed on July 31, 2020

Income Statement

Concept	2020 Q2	2019 Q2
Revenue	$138.3M	$175.1M
YoY Change	-20.99%	19.3%
Cost Of Revenue	$11.71M	$41.00M
YoY Change	-71.44%	142.03%
Gross Profit	$126.6M	$134.1M
YoY Change	-5.56%	3.29%
Gross Profit Margin	91.53%	76.58%
Selling, General & Admin	$8.158M	$9.386M
YoY Change	-13.08%	23.05%
% of Gross Profit	6.44%	7.0%
Research & Development	$1.300M	$900.0K
YoY Change	44.44%	-25.0%
% of Gross Profit	1.03%	0.67%
Depreciation & Amortization	$34.10M	$35.30M
YoY Change	-3.4%	4.75%
% of Gross Profit	26.93%	26.33%
Operating Expenses	$8.158M	$9.386M
YoY Change	-13.08%	23.05%
Operating Profit	$118.5M	$124.7M
YoY Change	-5.0%	225.51%
Interest Expense	$16.80M	-$16.20M
YoY Change	-203.69%	-5.26%
% of Operating Profit	14.18%	-12.99%
Other Income/Expense, Net	-$600.0K
YoY Change
Pretax Income	$24.70M	$109.0M
YoY Change	-77.34%	424.51%
Income Tax	$30.00K	-$176.0K
% Of Pretax Income	0.12%	-0.16%
Net Earnings	$23.50M	$106.8M
YoY Change	-78.0%	449.51%
Net Earnings / Revenue	16.99%	61.0%
Basic Earnings Per Share	$0.21	$0.95
Diluted Earnings Per Share	$0.21	$0.95
COMMON SHARES
Basic Shares Outstanding	111.8M shares	111.6M shares
Diluted Shares Outstanding	112.1M shares	113.1M shares

Balance Sheet

Concept	2020 Q2	2019 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$21.60M	$46.30M
YoY Change	-53.35%	444.71%
Cash & Equivalents	$21.60M	$46.28M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory		$54.40M
Prepaid Expenses
Receivables	$30.40M	$58.20M
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$52.00M	$158.9M
YoY Change	-67.28%	113.58%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.594B	$3.271B
YoY Change	9.88%	50945.73%
Goodwill
YoY Change
Intangibles	$24.77M	$31.16M
YoY Change	-20.52%	-38.4%
Long-Term Investments	$59.70M	$75.60M
YoY Change	-21.03%	50.9%
Other Assets	$74.90M	$68.90M
YoY Change	8.71%	4.08%
Total Long-Term Assets	$3.959B	$3.645B
YoY Change	8.64%	3.01%
TOTAL ASSETS
Total Short-Term Assets	$52.00M	$158.9M
Total Long-Term Assets	$3.959B	$3.645B
Total Assets	$4.011B	$3.803B
YoY Change	5.46%	5.29%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$149.8M	$152.2M
YoY Change	-1.58%	71.2%
Accrued Expenses	$20.80M	$16.60M
YoY Change	25.3%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due	$14.10M
YoY Change
Total Short-Term Liabilities	$246.5M	$227.6M
YoY Change	8.3%	58.83%
LONG-TERM LIABILITIES
Long-Term Debt	$1.999B	$1.786B
YoY Change	11.93%	-4.62%
Other Long-Term Liabilities	$86.20M	$41.30M
YoY Change	108.72%	-35.47%
Total Long-Term Liabilities	$2.085B	$1.827B
YoY Change	14.12%	-5.64%
TOTAL LIABILITIES
Total Short-Term Liabilities	$246.5M	$227.6M
Total Long-Term Liabilities	$2.085B	$1.827B
Total Liabilities	$2.331B	$2.055B
YoY Change	13.47%	-1.19%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$1.122M	$1.119M
YoY Change	0.27%	8.33%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.617B	$1.672B
YoY Change
Total Liabilities & Shareholders Equity	$4.011B	$3.803B
YoY Change	5.46%	5.29%

Cashflow Statement

Concept	2020 Q2	2019 Q2
OPERATING ACTIVITIES
Net Income	$23.50M	$106.8M
YoY Change	-78.0%	449.51%
Depreciation, Depletion And Amortization	$34.10M	$35.30M
YoY Change	-3.4%	4.75%
Cash From Operating Activities	$74.30M	$57.10M
YoY Change	30.12%	4.77%
INVESTING ACTIVITIES
Capital Expenditures	-$104.7M	-$127.2M
YoY Change	-17.69%	102.23%
Acquisitions
YoY Change
Other Investing Activities	-$8.100M	$234.8M
YoY Change	-103.45%	25988.89%
Cash From Investing Activities	-$112.8M	$107.6M
YoY Change	-204.83%	-273.55%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-98.50M	-125.7M
YoY Change	-21.64%	-1776.0%
NET CHANGE
Cash From Operating Activities	74.30M	57.10M
Cash From Investing Activities	-112.8M	107.6M
Cash From Financing Activities	-98.50M	-125.7M
Net Change In Cash	-137.0M	39.00M
YoY Change	-451.28%	4187593113600010000.0%
FREE CASH FLOW
Cash From Operating Activities	$74.30M	$57.10M
Capital Expenditures	-$104.7M	-$127.2M
Free Cash Flow	$179.0M	$184.3M
YoY Change	-2.88%	56.98%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Entity Central Index Key EntityCentralIndexKey	0000860546
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
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	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.550
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	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	1-14023
	dei	Entity Registrant Name EntityRegistrantName	Corporate Office Properties Trust
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	23-2947217
	dei	Entity Address Address Line1 EntityAddressAddressLine1	6711 Columbia Gateway Drive
	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 300
	dei	Entity Address City Or Town EntityAddressCityOrTown	Columbia
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	dei	Entity Address State Or Province EntityAddressStateOrProvince	MD
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	21046
	dei	City Area Code CityAreaCode	443
	dei	Local Phone Number LocalPhoneNumber	285-5400
	dei	Security12b Title Security12bTitle	Common Shares of beneficial interest, $0.01 par value
	dei	Trading Symbol TradingSymbol	OFC
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2020Q2	us-gaap	Development In Process DevelopmentInProcess	624282000	USD
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CY2020Q2	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	3513099000	USD
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	us-gaap	Profit Loss ProfitLoss	131881000	USD
CY2020Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	284000	USD
CY2019Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	1339000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	571000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	1596000	USD
CY2020Q2	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Nonredeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersNonredeemable	77000	USD
CY2019Q2	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Nonredeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersNonredeemable	165000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Nonredeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersNonredeemable	154000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Nonredeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersNonredeemable	330000	USD
CY2020Q2	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	1263000	USD
CY2019Q2	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	1268000	USD
	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	2395000	USD
	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	2305000	USD
CY2020Q2	ofc	Net Income Loss Available To Common Stockholders Including Participating Securities NetIncomeLossAvailableToCommonStockholdersIncludingParticipatingSecurities	23497000	USD
CY2019Q2	ofc	Net Income Loss Available To Common Stockholders Including Participating Securities NetIncomeLossAvailableToCommonStockholdersIncludingParticipatingSecurities	106791000	USD
	ofc	Net Income Loss Available To Common Stockholders Including Participating Securities NetIncomeLossAvailableToCommonStockholdersIncludingParticipatingSecurities	47551000	USD
	ofc	Net Income Loss Available To Common Stockholders Including Participating Securities NetIncomeLossAvailableToCommonStockholdersIncludingParticipatingSecurities	127650000	USD
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.95
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.15
CY2020Q2	us-gaap	Profit Loss ProfitLoss	25121000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	109563000	USD
	us-gaap	Profit Loss ProfitLoss	50671000	USD
	us-gaap	Profit Loss ProfitLoss	131881000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-3315000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-13545000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-41020000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-22390000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-935000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	557000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-1066000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	1127000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2380000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-14102000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-39954000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-23517000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	22741000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	95461000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	10717000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	108364000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1556000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2597000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2235000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3941000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21185000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	92864000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8482000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	104423000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1656178000	USD
CY2019Q2	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	1000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1833000	USD
CY2019Q2	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	103000	USD
CY2019Q2	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
CY2019Q2	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	94592000	USD
CY2019Q2	us-gaap	Dividends Dividends	30755000	USD
CY2019Q2	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	553000	USD
CY2019Q2	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	4000	USD
CY2019Q2	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-2076000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1719111000	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1665186000	USD
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1736000	USD
CY2020Q2	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	80000	USD
CY2020Q2	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
CY2020Q2	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	21624000	USD
CY2020Q2	us-gaap	Dividends Dividends	30856000	USD
CY2020Q2	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	442000	USD
CY2020Q2	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	8000	USD
CY2020Q2	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-236000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1656924000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1627048000	USD
	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	1000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3635000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1920000	USD
	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	106820000	USD
	us-gaap	Dividends Dividends	61509000	USD
	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	1103000	USD
	ofc	Minority Interest Increase From Contributions Including Joint Ventures MinorityInterestIncreaseFromContributionsIncludingJointVentures	2570000	USD
	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	8000	USD
	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-2875000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1719111000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1719245000	USD
	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2946000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1572000	USD
	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	8642000	USD
	us-gaap	Dividends Dividends	61694000	USD
	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	862000	USD
	ofc	Minority Interest Increase From Contributions Including Joint Ventures MinorityInterestIncreaseFromContributionsIncludingJointVentures	112000	USD
	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	15000	USD
	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-4337000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1656924000	USD
	ofc	Revenues From Real Estate Operations Received RevenuesFromRealEstateOperationsReceived	265833000	USD
	ofc	Revenues From Real Estate Operations Received RevenuesFromRealEstateOperationsReceived	257832000	USD
	ofc	Construction Contract And Other Service Revenues Received ConstructionContractAndOtherServiceRevenuesReceived	42149000	USD
	ofc	Construction Contract And Other Service Revenues Received ConstructionContractAndOtherServiceRevenuesReceived	21449000	USD
	ofc	Property Operating Expenses Paid PropertyOperatingExpensesPaid	86934000	USD
	ofc	Property Operating Expenses Paid PropertyOperatingExpensesPaid	83305000	USD
	ofc	Construction Contract And Other Service Expenses Paid ConstructionContractAndOtherServiceExpensesPaid	32107000	USD
	ofc	Construction Contract And Other Service Expenses Paid ConstructionContractAndOtherServiceExpensesPaid	31157000	USD
	ofc	Generaland Administrative Leasing Business Developmentand Land Carry Paid GeneralandAdministrativeLeasingBusinessDevelopmentandLandCarryPaid	16969000	USD
	ofc	Generaland Administrative Leasing Business Developmentand Land Carry Paid GeneralandAdministrativeLeasingBusinessDevelopmentandLandCarryPaid	16541000	USD
	us-gaap	Interest Paid Net InterestPaidNet	31581000	USD
	us-gaap	Interest Paid Net InterestPaidNet	34896000	USD
	ofc	Paymentsof Lease Incentives PaymentsofLeaseIncentives	5611000	USD
	ofc	Paymentsof Lease Incentives PaymentsofLeaseIncentives	3228000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	1757000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	1661000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	136537000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	111815000	USD
	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	185357000	USD
	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	219633000	USD
	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	16489000	USD
	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	7585000	USD
	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	11576000	USD
	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	8920000	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	129783000	USD
	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	USD
	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	107517000	USD
	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	0	USD
	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	11104000	USD
	us-gaap	Payments For Leasing Costs PaymentsForLeasingCosts	8424000	USD
	us-gaap	Payments For Leasing Costs PaymentsForLeasingCosts	7632000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	5442000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3944000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-227288000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-13630000	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	251000000	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	258000000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	189359000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	10606000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	259000000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	308000000	USD
	ofc	Scheduled Principal Amortization Repayments Of Long Term Debt ScheduledPrincipalAmortizationRepaymentsOfLongTermDebt	2044000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	67075000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	70527000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1993000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1801000	USD
	us-gaap	Straight Line Rent StraightLineRent	1070000	USD
	us-gaap	Straight Line Rent StraightLineRent	2419000	USD
	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	5000	USD
	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	84469000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3027000	USD
	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	29507000	USD
	ofc	Increase Decrease In Advance Rent And Security Deposit Liability IncreaseDecreaseInAdvanceRentAndSecurityDepositLiability	-3161000	USD
	ofc	Increase Decrease In Advance Rent And Security Deposit Liability IncreaseDecreaseInAdvanceRentAndSecurityDepositLiability	-2602000	USD
	ofc	Scheduled Principal Amortization Repayments Of Long Term Debt ScheduledPrincipalAmortizationRepaymentsOfLongTermDebt	2193000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1261000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	46415000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	61667000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	61040000	USD
	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	863000	USD
	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	1115000	USD
	ofc	Paymentsof Distributions Redeemable Noncontrolling Interest PaymentsofDistributionsRedeemableNoncontrollingInterest	12662000	USD
	ofc	Paymentsof Distributions Redeemable Noncontrolling Interest PaymentsofDistributionsRedeemableNoncontrollingInterest	687000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1572000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1920000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2803000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	533000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	98487000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-59401000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	7736000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	38784000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18130000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11950000	USD
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	25866000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	50734000	USD
	us-gaap	Profit Loss ProfitLoss	50671000	USD
	us-gaap	Profit Loss ProfitLoss	131881000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3283000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	1263000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	2996000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-5039000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	31846000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-23202000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	852000	USD
	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	-8971000	USD
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	25866000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	50734000	USD
	ofc	Increase Decrease In Accrued Capital Improvements Leasing And Other Investing Activity Costs IncreaseDecreaseInAccruedCapitalImprovementsLeasingAndOtherInvestingActivityCosts	12940000	USD
	ofc	Increase Decrease In Accrued Capital Improvements Leasing And Other Investing Activity Costs IncreaseDecreaseInAccruedCapitalImprovementsLeasingAndOtherInvestingActivityCosts	29862000	USD
	ofc	Rightof Use Asset Contributed By Noncontrolling Interest RightofUseAssetContributedByNoncontrollingInterest	0	USD
	ofc	Rightof Use Asset Contributed By Noncontrolling Interest RightofUseAssetContributedByNoncontrollingInterest	2570000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3381000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	136537000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	111815000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	255000	USD
	ofc	Noncashor Part Noncash Disposition Decreasein Propertyin Connection With Partial Saleof Properties Net NoncashorPartNoncashDispositionDecreaseinPropertyinConnectionWithPartialSaleofPropertiesNet	0	USD
	ofc	Noncashor Part Noncash Disposition Decreasein Propertyin Connection With Partial Saleof Properties Net NoncashorPartNoncashDispositionDecreaseinPropertyinConnectionWithPartialSaleofPropertiesNet	99288000	USD
	ofc	Increasein Investmentin Unconsolidated Real Estate Joint Venturein Connection With Partial Saleof Properties IncreaseinInvestmentinUnconsolidatedRealEstateJointVentureinConnectionWithPartialSaleofProperties	0	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	14733000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8066000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	3397000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	3884000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18130000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11950000	USD
CY2020Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	21596000	USD
CY2019Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	46282000	USD
CY2020Q2	us-gaap	Restricted Cash RestrictedCash	4270000	USD
CY2019Q2	us-gaap	Restricted Cash RestrictedCash	4452000	USD
	ofc	Increasein Investmentin Unconsolidated Real Estate Joint Venturein Connection With Partial Saleof Properties IncreaseinInvestmentinUnconsolidatedRealEstateJointVentureinConnectionWithPartialSaleofProperties	26500000	USD
	ofc	Increase Decrease In Fair Value Of Derivatives Applied To Aocl And Noncontrolling Interests IncreaseDecreaseInFairValueOfDerivativesAppliedToAoclAndNoncontrollingInterests	-39953000	USD
	ofc	Increase Decrease In Fair Value Of Derivatives Applied To Aocl And Noncontrolling Interests IncreaseDecreaseInFairValueOfDerivativesAppliedToAoclAndNoncontrollingInterests	-23585000	USD
CY2020Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	31302000	USD
CY2019Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	31346000	USD
	ofc	Equity Change Stock Issued During Period Value Conversion Of Units EquityChangeStockIssuedDuringPeriodValueConversionOfUnits	182000	USD
	ofc	Equity Change Stock Issued During Period Value Conversion Of Units EquityChangeStockIssuedDuringPeriodValueConversionOfUnits	80000	USD
	ofc	Equity Change Adjustments To Additional Paid In Capital Reallocation Of Minority Interest EquityChangeAdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest	25000	USD
	ofc	Equity Change Adjustments To Additional Paid In Capital Reallocation Of Minority Interest EquityChangeAdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest	834000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	4337000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	2875000	USD
	us-gaap	Nature Of Operations NatureOfOperations	Organization<div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Corporate Office Properties Trust (“COPT”) and subsidiaries (collectively, the “Company”) is a fully-integrated and self-managed real estate investment trust (“REIT”). Corporate Office Properties, L.P. (“COPLP”) and subsidiaries (collectively, the “Operating Partnership”) is the entity through which COPT, the sole general partner of COPLP, conducts almost all of its operations and owns almost all of its assets. Unless otherwise expressly stated or the context otherwise requires, “we”, “us” and “our” as used herein refer to each of the Company and the Operating Partnership. We own, manage, lease, develop and selectively acquire office and data center properties. The majority of our portfolio is in locations that support the United States Government (“USG”) and its contractors, most of whom are engaged in national security, defense and information technology (“IT”) related activities servicing what we believe are growing, durable, priority missions (“Defense/IT Locations”). We also own a portfolio of office properties located in select urban/urban-like submarkets in the Greater Washington, DC/Baltimore region with durable Class-A office fundamentals and characteristics (“Regional Office”). As of </span><span style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">June 30, 2020</span><span style="font-family:inherit;font-size:10pt;">, our properties included the following:</span></div><div style="line-height:120%;padding-left:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>174</span></span><span style="font-family:inherit;font-size:10pt;"> properties totaling </span><span style="font-family:inherit;font-size:10pt;"><span>19.8 million</span></span><span style="font-family:inherit;font-size:10pt;"> square feet comprised of </span><span style="font-family:inherit;font-size:10pt;"><span>15.6 million</span></span><span style="font-family:inherit;font-size:10pt;"> square feet in </span><span style="font-family:inherit;font-size:10pt;"><span>150</span></span><span style="font-family:inherit;font-size:10pt;"> office properties and </span><span style="font-family:inherit;font-size:10pt;"><span>4.2 million</span></span><span style="font-family:inherit;font-size:10pt;"> square feet in </span><span style="font-family:inherit;font-size:10pt;"><span>24</span></span><span style="font-family:inherit;font-size:10pt;"> single-tenant data center shell properties (“data center shells”). We owned </span><span style="font-family:inherit;font-size:10pt;"><span>15</span></span><span style="font-family:inherit;font-size:10pt;"> of these data center shells through unconsolidated real estate joint ventures;</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">a wholesale data center with a critical load of </span><span style="font-family:inherit;font-size:10pt;"><span>19.25</span></span><span style="font-family:inherit;font-size:10pt;"> megawatts;</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>11</span></span><span style="font-family:inherit;font-size:10pt;"> properties under development (</span><span style="font-family:inherit;font-size:10pt;"><span>nine</span></span><span style="font-family:inherit;font-size:10pt;"> office properties and </span><span style="font-family:inherit;font-size:10pt;"><span>two</span></span><span style="font-family:inherit;font-size:10pt;"> data center shells), including </span><span style="font-family:inherit;font-size:10pt;"><span>one</span></span><span style="font-family:inherit;font-size:10pt;"> partially-operational property, and expansions of </span><span style="font-family:inherit;font-size:10pt;"><span>three</span></span><span style="font-family:inherit;font-size:10pt;"> fully-operational properties that we estimate will total approximately </span><span style="font-family:inherit;font-size:10pt;"><span>1.9 million</span></span><span style="font-family:inherit;font-size:10pt;"> square feet upon completion; and</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">approximately </span><span style="font-family:inherit;font-size:10pt;"><span>900</span></span><span style="font-family:inherit;font-size:10pt;"> acres of land controlled for future development that we believe could be developed into approximately </span><span style="font-family:inherit;font-size:10pt;"><span>11.5 million</span></span><span style="font-family:inherit;font-size:10pt;"> square feet and </span><span style="font-family:inherit;font-size:10pt;"><span>43</span></span><span style="font-family:inherit;font-size:10pt;"> acres of other land.</span></div></td></tr></table><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">COPLP owns real estate directly and through subsidiary partnerships and limited liability companies (“LLCs”). In addition to owning real estate, COPLP also owns subsidiaries that provide real estate services such as property management, development and construction services primarily for our properties but also for third parties. Some of these services are performed by a taxable REIT subsidiary (“TRS”).</span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Equity interests in COPLP are in the form of common and preferred units. As of </span><span style="font-family:inherit;font-size:10pt;">June 30, 2020</span><span style="font-family:inherit;font-size:10pt;">, COPT owned </span><span style="font-family:inherit;font-size:10pt;"><span>98.6%</span></span><span style="font-family:inherit;font-size:10pt;"> of the outstanding COPLP common units (“common units”); the remaining common units and all of the outstanding COPLP preferred units (“preferred units”) were owned by third parties. Common units not owned by COPT carry certain redemption rights. The number of common units owned by COPT is equivalent to the number of outstanding common shares of beneficial interest (“common shares”) of COPT, and the entitlement of common units to quarterly distributions and payments in liquidation is substantially the same as that of COPT common shareholders. In the case of any series of preferred units held by COPT, there would be a series of preferred shares of beneficial interest (“preferred shares”) in COPT that is equivalent in number and carries substantially the same terms as such series of COPLP preferred units. </span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">COPT’s common shares are publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “OFC”. </span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Because COPLP is managed by COPT, and COPT conducts substantially all of its operations through COPLP, we refer to COPT’s executive officers as COPLP’s executive officers; similarly, although COPLP does not have a board of trustees, we refer to COPT’s Board of Trustees as COPLP’s Board of Trustees.</span></div>
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1328000	USD
CY2020Q2	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	14000	USD
CY2020Q2	ofc	Lessee Lease Liability Payments Due Next Twelve Months LesseeLeaseLiabilityPaymentsDueNextTwelveMonths	1342000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1138000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	14000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1162000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	14000	USD
CY2019Q4	ofc	Lessee Lease Liability Payments Due Year Three LesseeLeaseLiabilityPaymentsDueYearThree	1176000	USD
CY2020Q2	us-gaap	Lease Cost LeaseCost	454000	USD
CY2019Q2	us-gaap	Lease Cost LeaseCost	425000	USD
	us-gaap	Lease Cost LeaseCost	894000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1358000	USD
CY2020Q2	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	0	USD
CY2020Q2	ofc	Lessee Lease Liability Payments Due Year Three LesseeLeaseLiabilityPaymentsDueYearThree	1358000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1167000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2019Q4	ofc	Lessee Lease Liability Payments Due Year Four LesseeLeaseLiabilityPaymentsDueYearFour	1167000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1363000	USD
CY2020Q2	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2020Q2	ofc	Lessee Lease Liability Payments Due Year Four LesseeLeaseLiabilityPaymentsDueYearFour	1363000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1173000	USD
	us-gaap	Lease Cost LeaseCost	838000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	541000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	550000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	14000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	0	USD
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Reclassifications</span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements with no effect on previously reported net income or equity.</span></div>
CY2019Q4	ofc	Off Balance Sheet Credit Loss Exposure Allowancefor Credit Loss OffBalanceSheetCreditLossExposureAllowanceforCreditLoss	0	USD
CY2019Q4	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLoss	97000	USD
	ofc	Off Balance Sheet Credit Loss Exposure Allowancefor Credit Loss Cumulative Effectof Changefor Adoptionof Credit Loss Guidance OffBalanceSheetCreditLossExposureAllowanceforCreditLossCumulativeEffectofChangeforAdoptionofCreditLossGuidance	1340000	USD
	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Cumulative Effectof Changefor Adoptionof Credit Loss Guidance CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossCumulativeEffectofChangeforAdoptionofCreditLossGuidance	5541000	USD
	ofc	Off Balance Sheet Credit Loss Exposure Credit Loss Expense Reversal OffBalanceSheetCreditLossExposureCreditLossExpenseReversal	316000	USD
	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	1304000	USD
CY2020Q2	ofc	Off Balance Sheet Credit Loss Exposure Allowancefor Credit Loss OffBalanceSheetCreditLossExposureAllowanceforCreditLoss	1656000	USD
CY2020Q2	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLoss	6942000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	636000	USD
CY2020Q2	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	660000	USD
CY2020Q2	ofc	Lessee Lease Liability Payments Remainderof Fiscal Year LesseeLeaseLiabilityPaymentsRemainderofFiscalYear	1296000	USD
	ofc	Lessor Operating Lease Average Termof Contract LessorOperatingLeaseAverageTermofContract	P5Y
CY2020Q2	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	103993000	USD
CY2019Q2	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	104193000	USD
	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	208102000	USD
	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	208837000	USD
CY2020Q2	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	28154000	USD
CY2019Q2	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	27222000	USD
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	55057000	USD
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	53481000	USD
CY2020Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	132147000	USD
CY2019Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	131415000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	263159000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	262318000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1092000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	674000	USD
CY2019Q4	ofc	Lessee Lease Liability Payments Due Next Twelve Months LesseeLeaseLiabilityPaymentsDueNextTwelveMonths	1766000	USD
CY2019Q4	ofc	Lessee Lease Liability Payments Due Year Five LesseeLeaseLiabilityPaymentsDueYearFive	1173000	USD
CY2020Q2	ofc	Lessee Operating Lease Liabilitytobe Paidafter Year Four LesseeOperatingLeaseLiabilitytobePaidafterYearFour	113780000	USD
CY2020Q2	ofc	Finance Lease Liability Payments Due After Year Four FinanceLeaseLiabilityPaymentsDueAfterYearFour	0	USD
CY2020Q2	ofc	Lessee Lease Liability Payments Dueafter Year Four LesseeLeaseLiabilityPaymentsDueafterYearFour	113780000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	100609000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2019Q4	ofc	Lessee Lease Liability Payments Dueafter Year Five LesseeLeaseLiabilityPaymentsDueafterYearFive	100609000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	119817000	USD
CY2020Q2	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	688000	USD
CY2020Q2	ofc	Lessee Lease Liability Payments Due LesseeLeaseLiabilityPaymentsDue	120505000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	106341000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	702000	USD
CY2019Q4	ofc	Lessee Lease Liability Payments Due LesseeLeaseLiabilityPaymentsDue	107043000	USD
CY2020Q2	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	203627000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	388310000	USD
CY2020Q2	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	372518000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	336482000	USD
CY2020Q2	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	335187000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	299356000	USD
CY2020Q2	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	281094000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	245661000	USD
CY2020Q2	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	231731000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	195246000	USD
CY2020Q2	ofc	Lessor Operating Lease Paymenttobe Receivedafter Year Four LessorOperatingLeasePaymenttobeReceivedafterYearFour	634608000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	474741000	USD
CY2020Q2	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	2058765000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	1939796000	USD
CY2020Q2	ofc	Lessee Rightof Use Asset LesseeRightofUseAsset	71500000	USD
CY2020Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	31009000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	27864000	USD
CY2020Q2	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	40441000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	40458000	USD
CY2020Q2	ofc	Lease Rightof Use Assets LeaseRightofUseAssets	71450000	USD
CY2019Q4	ofc	Lease Rightof Use Assets LeaseRightofUseAssets	68322000	USD
CY2020Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	20796000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	17317000	USD
CY2020Q2	us-gaap	Finance Lease Liability FinanceLeaseLiability	688000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	702000	USD
CY2020Q2	ofc	Lease Liabilities LeaseLiabilities	21484000	USD
CY2019Q4	ofc	Lease Liabilities LeaseLiabilities	18019000	USD
CY2020Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P65Y
CY2020Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0722
CY2020Q2	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0362
CY2019Q4	ofc	Lessee Lease Liability Payments Due Year Two LesseeLeaseLiabilityPaymentsDueYearTwo	1152000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1352000	USD
CY2020Q2	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	14000	USD
CY2020Q2	ofc	Lessee Lease Liability Payments Due Year Two LesseeLeaseLiabilityPaymentsDueYearTwo	1366000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	99021000	USD
CY2020Q2	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	0	USD
CY2020Q2	ofc	Lessee Lease Liability Imputed Interest LesseeLeaseLiabilityImputedInterest	99021000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	89024000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	0	USD
CY2019Q4	ofc	Lessee Lease Liability Imputed Interest LesseeLeaseLiabilityImputedInterest	89024000	USD
CY2020Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	20796000	USD
CY2020Q2	us-gaap	Finance Lease Liability FinanceLeaseLiability	688000	USD
CY2020Q2	ofc	Lease Liabilities LeaseLiabilities	21484000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	17317000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	702000	USD
CY2019Q4	ofc	Lease Liabilities LeaseLiabilities	18019000	USD
CY2020Q2	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	2532000	USD
CY2019Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	3060000	USD
CY2020Q2	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	78059000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	96076000	USD
CY2020Q2	us-gaap	Long Term Debt LongTermDebt	2012019000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1831139000	USD
CY2020Q2	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3200000	USD
CY2019Q2	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2400000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	6500000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	4400000	USD
CY2019Q2	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	29803000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-3315000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-13545000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-41020000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-22390000	USD
	ofc	Numberof Joint Ventures With Redeemable Noncontrolling Interests NumberofJointVenturesWithRedeemableNoncontrollingInterests	2	joint_venture
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	29431000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	26260000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	12695000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	876000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	2075000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	1544000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	4337000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	2875000	USD
CY2020Q2	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	23148000	USD
	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	12009	shares
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.275
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.550
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12236000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	42299000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	25917000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	59249000	USD
CY2020Q2	us-gaap	Revenues Revenues	144774000	USD
CY2019Q2	us-gaap	Revenues Revenues	175070000	USD
	us-gaap	Revenues Revenues	290571000	USD
	us-gaap	Revenues Revenues	324010000	USD
CY2020Q2	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	1725000	USD
CY2019Q2	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	1251000	USD
	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	3438000	USD
	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	2470000	USD
CY2020Q2	ofc	Income Lossfrom Equity Method Investments Allocableto Depreciation Amortizationand Interest Expense IncomeLossfromEquityMethodInvestmentsAllocabletoDepreciationAmortizationandInterestExpense	1270000	USD
CY2019Q2	ofc	Income Lossfrom Equity Method Investments Allocableto Depreciation Amortizationand Interest Expense IncomeLossfromEquityMethodInvestmentsAllocabletoDepreciationAmortizationandInterestExpense	830000	USD
	ofc	Income Lossfrom Equity Method Investments Allocableto Depreciation Amortizationand Interest Expense IncomeLossfromEquityMethodInvestmentsAllocabletoDepreciationAmortizationandInterestExpense	2540000	USD
	ofc	Income Lossfrom Equity Method Investments Allocableto Depreciation Amortizationand Interest Expense IncomeLossfromEquityMethodInvestmentsAllocabletoDepreciationAmortizationandInterestExpense	1657000	USD
CY2020Q2	ofc	Income Lossin Non Real Estate Equity Method Investments IncomeLossinNonRealEstateEquityMethodInvestments	-1000	USD
CY2019Q2	ofc	Income Lossin Non Real Estate Equity Method Investments IncomeLossinNonRealEstateEquityMethodInvestments	-1000	USD
	ofc	Income Lossin Non Real Estate Equity Method Investments IncomeLossinNonRealEstateEquityMethodInvestments	-3000	USD
	ofc	Income Lossin Non Real Estate Equity Method Investments IncomeLossinNonRealEstateEquityMethodInvestments	-2000	USD
CY2020Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	454000	USD
CY2019Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	420000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	895000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	811000	USD
CY2019Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	9386000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	15644000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	18137000	USD
CY2020Q2	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	1262000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12236000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	42299000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	25917000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	59249000	USD
CY2020Q2	ofc	Construction Contract And Other Service Expenses ConstructionContractAndOtherServiceExpenses	11711000	USD
CY2019Q2	ofc	Construction Contract And Other Service Expenses ConstructionContractAndOtherServiceExpenses	41002000	USD
	ofc	Construction Contract And Other Service Expenses ConstructionContractAndOtherServiceExpenses	24832000	USD
	ofc	Construction Contract And Other Service Expenses ConstructionContractAndOtherServiceExpenses	57328000	USD
CY2020Q2	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	2282000	USD
CY2019Q2	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1849000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	3487000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	4135000	USD
CY2020Q2	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	615000	USD
CY2019Q2	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	0	USD
	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	1304000	USD
	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	0	USD
CY2020Q2	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	0	USD
CY2019Q2	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	84469000	USD
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	5000	USD
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	84469000	USD
CY2020Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	454000	USD
CY2019Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	420000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	895000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	811000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-176000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	79000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18000	USD
CY2020Q2	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	33612000	USD
CY2019Q2	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	34802000	USD
	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	66208000	USD
	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	69598000	USD
CY2020Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	8158000	USD
CY2019Q2	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	870000	USD
	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	2380000	USD
	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	1983000	USD
CY2020Q2	us-gaap	Interest And Debt Expense InterestAndDebtExpense	16797000	USD
CY2019Q2	us-gaap	Interest And Debt Expense InterestAndDebtExpense	18475000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	33637000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	37149000	USD
CY2020Q2	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	1725000	USD
CY2019Q2	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	1251000	USD
	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	3438000	USD
	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	2470000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	25121000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	109563000	USD
	us-gaap	Profit Loss ProfitLoss	50671000	USD
	us-gaap	Profit Loss ProfitLoss	131881000	USD
CY2020Q2	us-gaap	Assets Assets	4011325000	USD
CY2019Q2	us-gaap	Assets Assets	3803469000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12236000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	42299000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	25917000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	59249000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12236000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	42299000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	25917000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	59249000	USD
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	70500000	USD
CY2020Q2	ofc	Revenue Remaining Performance Obligation Amounttobe Recognized Duringthe Remainderofthe Year RevenueRemainingPerformanceObligationAmounttobeRecognizedDuringtheRemainderoftheYear	20000000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110759000	shares
CY2020Q2	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	23497000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	106791000	USD
	us-gaap	Net Income Loss NetIncomeLoss	47551000	USD
	us-gaap	Net Income Loss NetIncomeLoss	127650000	USD
CY2020Q2	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	115000	USD
CY2019Q2	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	364000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	220000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	413000	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	23382000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	106427000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	47331000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	127237000	USD
CY2020Q2	ofc	Dilutive Securities Effecton Basic Earnings Per Share Preferred Units DilutiveSecuritiesEffectonBasicEarningsPerSharePreferredUnits	0	USD
CY2019Q2	ofc	Dilutive Securities Effecton Basic Earnings Per Share Preferred Units DilutiveSecuritiesEffectonBasicEarningsPerSharePreferredUnits	165000	USD
	ofc	Dilutive Securities Effecton Basic Earnings Per Share Preferred Units DilutiveSecuritiesEffectonBasicEarningsPerSharePreferredUnits	0	USD
	ofc	Dilutive Securities Effecton Basic Earnings Per Share Preferred Units DilutiveSecuritiesEffectonBasicEarningsPerSharePreferredUnits	0	USD
CY2020Q2	ofc	Dilutive Securities Effecton Basic Earnings Per Share Dilutive Redeemable Noncontrolling Interests DilutiveSecuritiesEffectonBasicEarningsPerShareDilutiveRedeemableNoncontrollingInterests	0	USD
CY2019Q2	ofc	Dilutive Securities Effecton Basic Earnings Per Share Dilutive Redeemable Noncontrolling Interests DilutiveSecuritiesEffectonBasicEarningsPerShareDilutiveRedeemableNoncontrollingInterests	902000	USD
	ofc	Dilutive Securities Effecton Basic Earnings Per Share Dilutive Redeemable Noncontrolling Interests DilutiveSecuritiesEffectonBasicEarningsPerShareDilutiveRedeemableNoncontrollingInterests	0	USD
	ofc	Dilutive Securities Effecton Basic Earnings Per Share Dilutive Redeemable Noncontrolling Interests DilutiveSecuritiesEffectonBasicEarningsPerShareDilutiveRedeemableNoncontrollingInterests	66000	USD
CY2020Q2	ofc	Dilutive Securities Effecton Basic Earnings Per Share Partnership Units DilutiveSecuritiesEffectonBasicEarningsPerSharePartnershipUnits	0	USD
CY2019Q2	ofc	Dilutive Securities Effecton Basic Earnings Per Share Partnership Units DilutiveSecuritiesEffectonBasicEarningsPerSharePartnershipUnits	0	USD
	ofc	Dilutive Securities Effecton Basic Earnings Per Share Partnership Units DilutiveSecuritiesEffectonBasicEarningsPerSharePartnershipUnits	0	USD
	ofc	Dilutive Securities Effecton Basic Earnings Per Share Partnership Units DilutiveSecuritiesEffectonBasicEarningsPerSharePartnershipUnits	1515000	USD
CY2020Q2	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	6000	USD
CY2019Q2	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	18000	USD
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	14000	USD
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	22000	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	23388000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	107512000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	47345000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	128840000	USD
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111800000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111557000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111762000	shares
CY2019Q2	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	176000	shares
	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2020Q2	ofc	Incremental Common Shares Attributable To Conversion Of Common Units IncrementalCommonSharesAttributableToConversionOfCommonUnits	0	shares
CY2019Q2	ofc	Incremental Common Shares Attributable To Conversion Of Common Units IncrementalCommonSharesAttributableToConversionOfCommonUnits	0	shares
	ofc	Incremental Common Shares Attributable To Conversion Of Common Units IncrementalCommonSharesAttributableToConversionOfCommonUnits	0	shares
	ofc	Incremental Common Shares Attributable To Conversion Of Common Units IncrementalCommonSharesAttributableToConversionOfCommonUnits	1329000	shares
CY2020Q2	ofc	Incremental Common Shares Attributableto Dilutive Effectof Redeemable Noncontrolling Interests IncrementalCommonSharesAttributabletoDilutiveEffectofRedeemableNoncontrollingInterests	0	shares
CY2019Q2	ofc	Incremental Common Shares Attributableto Dilutive Effectof Redeemable Noncontrolling Interests IncrementalCommonSharesAttributabletoDilutiveEffectofRedeemableNoncontrollingInterests	1062000	shares
	ofc	Incremental Common Shares Attributableto Dilutive Effectof Redeemable Noncontrolling Interests IncrementalCommonSharesAttributabletoDilutiveEffectofRedeemableNoncontrollingInterests	0	shares
	ofc	Incremental Common Shares Attributableto Dilutive Effectof Redeemable Noncontrolling Interests IncrementalCommonSharesAttributabletoDilutiveEffectofRedeemableNoncontrollingInterests	130000	shares
CY2020Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	321000	shares
CY2019Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	310000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	280000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	289000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112121000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113105000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112042000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112507000	shares
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.95
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.15
CY2020Q2	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	3200000	USD
CY2020Q2	ofc	Property Subjectto Environmental Indemnity Numberof Properties PropertySubjecttoEnvironmentalIndemnityNumberofProperties	3	property
CY2020Q2	ofc	Maximum Additional Costs Agreed To Be Paid By The Entity Under Environmental Indemnification Agreement MaximumAdditionalCostsAgreedToBePaidByTheEntityUnderEnvironmentalIndemnificationAgreement	19000000	USD

Files In Submission

Name	View Source	Status
0000860546-20-000029-index-headers.html	Edgar Link	pending
0000860546-20-000029-index.html	Edgar Link	pending
0000860546-20-000029.txt	Edgar Link	pending
0000860546-20-000029-xbrl.zip	Edgar Link	pending
copt06302020ex311.htm	Edgar Link	pending
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copt10qdoc06302020_htm.xml	Edgar Link	completed
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$CDP
COPT Defense Properties Stock $cdp

2020 Q2 Form 10-Q Financial Statement

#000086054620000029 Filed on July 31, 2020

Income Statement

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Facts In Submission

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$CDP COPT Defense Properties Stock $cdp

2020 Q2 Form 10-Q Financial Statement

#000086054620000029 Filed on July 31, 2020

Income Statement

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Cashflow Statement

Facts In Submission

Files In Submission

$CDP
COPT Defense Properties Stock $cdp