$CDP
COPT Defense Properties Stock $cdp

$cdp Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000086054621000051 Filed on November 01, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue	$185.9M	$166.9M	$148.8M
YoY Change	18.73%	12.18%	-6.67%
Cost Of Revenue	$313.3M	$27.09M	$19.22M
YoY Change	319.47%	40.94%	-30.87%
Gross Profit	$351.1M	$139.8M	$129.6M
YoY Change	293.17%	7.91%	-1.56%
Gross Profit Margin	188.83%	83.77%	87.08%
Selling, General & Admin	$40.18M	$9.342M	$7.467M
YoY Change	272.06%	25.11%	-5.83%
% of Gross Profit	11.44%	6.68%	5.76%
Research & Development	$4.647M	$1.093M	$1.100M
YoY Change	364.7%	-0.64%	10.0%
% of Gross Profit	1.32%	0.78%	0.85%
Depreciation & Amortization	$137.6M	$36.62M	$35.80M
YoY Change	270.82%	2.28%	1.7%
% of Gross Profit	39.18%	26.19%	27.63%
Operating Expenses	$182.4M	$9.342M	$7.467M
YoY Change	276.87%	25.11%	-5.83%
Operating Profit	$168.7M	$130.5M	$122.1M
YoY Change	312.47%	6.86%	-1.28%
Interest Expense	-$56.43M	$15.72M	$17.15M
YoY Change	321.09%	-8.35%	0.15%
% of Operating Profit	-33.45%	12.05%	14.05%
Other Income/Expense, Net	$1.128M	$326.0K	$1.500M
YoY Change	41.0%	-78.27%
Pretax Income	$78.37M	$28.54M	-$31.80M
YoY Change	-6.49%	-189.75%	-239.98%
Income Tax	$145.0K	$47.00K	$16.00K
% Of Pretax Income	0.19%	0.16%
Net Earnings	$13.71M	$27.10M	-$31.85M
YoY Change	-83.21%	-185.1%	-249.81%
Net Earnings / Revenue	7.37%	16.24%	-21.4%
Basic Earnings Per Share	$0.12	$0.24	-$0.29
Diluted Earnings Per Share	$0.12	$0.24	-$0.29
COMMON SHARES
Basic Shares Outstanding	112.3M shares	112.0M shares	111.8M shares
Diluted Shares Outstanding		112.5M shares	111.8M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$13.26M	$14.57M	$11.50M
YoY Change	-27.92%	26.7%	-66.18%
Cash & Equivalents	$13.26M	$14.57M	$11.46M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory	$192.7M	$2.821M
Prepaid Expenses
Receivables	$40.75M	$33.11M	$36.20M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$246.7M	$50.50M	$47.70M
YoY Change	311.19%	5.87%	-64.22%
LONG-TERM ASSETS
Property, Plant & Equipment	$9.599M	$10.01M	$3.674B
YoY Change	-7.99%	-99.73%	10.18%
Goodwill
YoY Change
Intangibles	$14.57M	$15.79M	$22.43M
YoY Change	-24.32%	-29.62%	-23.84%
Long-Term Investments	$54.18M	$54.77M	$58.80M
YoY Change	22.03%	-6.86%	-1.67%
Other Assets	$93.12M	$96.14M	$95.20M
YoY Change	7.77%	0.98%	4.96%
Total Long-Term Assets	$4.016B	$4.101B	$4.072B
YoY Change	-0.03%	0.69%	9.41%
TOTAL ASSETS
Total Short-Term Assets	$246.7M	$50.50M	$47.70M
Total Long-Term Assets	$4.016B	$4.101B	$4.072B
Total Assets	$4.262B	$4.151B	$4.120B
YoY Change	4.55%	0.75%	6.87%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$186.2M	$176.6M	$140.9M
YoY Change	30.48%	25.36%	-0.21%
Accrued Expenses	$29.34M	$29.63M	$26.40M
YoY Change	-4.42%	12.23%	58.08%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due			$178.1M
YoY Change
Total Short-Term Liabilities	$279.1M	$269.7M	$407.0M
YoY Change	15.29%	-33.74%	87.38%
LONG-TERM LIABILITIES
Long-Term Debt	$2.272B	$2.160B	$2.004B
YoY Change	9.09%	7.8%	7.51%
Other Long-Term Liabilities	$27.07M	$24.94M	$36.60M
YoY Change	-17.47%	-31.85%	-26.8%
Total Long-Term Liabilities	$2.299B	$2.185B	$2.040B
YoY Change	8.68%	7.09%	6.62%
TOTAL LIABILITIES
Total Short-Term Liabilities	$279.1M	$269.7M	$407.0M
Total Long-Term Liabilities	$2.299B	$2.185B	$2.040B
Total Liabilities	$2.578B	$2.454B	$2.447B
YoY Change	9.36%	0.3%	14.84%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$1.123M	$1.123M	$1.122M
YoY Change	0.09%	0.09%	0.09%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.623B	$1.637B	$1.609B
YoY Change
Total Liabilities & Shareholders Equity	$4.262B	$4.151B	$4.120B
YoY Change	4.55%	0.75%	6.87%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	$13.71M	$27.10M	-$31.85M
YoY Change	-83.21%	-185.1%	-249.81%
Depreciation, Depletion And Amortization	$137.6M	$36.62M	$35.80M
YoY Change	270.82%	2.28%	1.7%
Cash From Operating Activities	$49.25M	$61.89M	$22.50M
YoY Change	-37.98%	175.07%	-50.22%
INVESTING ACTIVITIES
Capital Expenditures	-$108.5M	-$76.80M	-$119.2M
YoY Change	47.97%	-35.57%	14.73%
Acquisitions
YoY Change
Other Investing Activities	$17.48M	-$4.595M	-$49.70M
YoY Change	-87.83%	-90.75%	-684.71%
Cash From Investing Activities	-$90.98M	-$81.39M	-$168.9M
YoY Change	-229.23%	-51.81%	77.23%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	40.90M	15.87M	135.2M
YoY Change	-128.72%	-88.26%	267.39%
NET CHANGE
Cash From Operating Activities	49.25M	61.89M	22.50M
Cash From Investing Activities	-90.98M	-81.39M	-168.9M
Cash From Financing Activities	40.90M	15.87M	135.2M
Net Change In Cash	-829.0K	-3.630M	-11.20M
YoY Change	-111.2%	-67.59%	-15.79%
FREE CASH FLOW
Cash From Operating Activities	$49.25M	$61.89M	$22.50M
Capital Expenditures	-$108.5M	-$76.80M	-$119.2M
Free Cash Flow	$157.7M	$138.7M	$141.7M
YoY Change	3.28%	-2.13%	-4.96%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0000860546
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
CY2019	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccountingStandardsUpdate201613Member
CY2021Q3	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilities
CY2020Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilities
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	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
	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
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2021Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	112324851	shares
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CY2020Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3237000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-59553000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3237000	USD
CY2021Q3	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
CY2020Q3	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-53196000	USD
	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-53196000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	28544000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-31803000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65937000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18052000	USD
CY2021Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	297000	USD
CY2020Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	477000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	779000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1372000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	103000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	95000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	28794000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	-31342000	USD
	us-gaap	Profit Loss ProfitLoss	66613000	USD
	us-gaap	Profit Loss ProfitLoss	19329000	USD
CY2021Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	357000	USD
CY2020Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	-386000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	831000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	185000	USD
CY2021Q3	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Nonredeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersNonredeemable	0	USD
CY2020Q3	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Nonredeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersNonredeemable	77000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Nonredeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersNonredeemable	0	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Nonredeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersNonredeemable	231000	USD
CY2021Q3	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	1336000	USD
CY2020Q3	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	812000	USD
	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	2949000	USD
	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	3207000	USD
CY2021Q3	ofc	Net Income Loss Available To Common Stockholders Including Participating Securities NetIncomeLossAvailableToCommonStockholdersIncludingParticipatingSecurities	27101000	USD
CY2020Q3	ofc	Net Income Loss Available To Common Stockholders Including Participating Securities NetIncomeLossAvailableToCommonStockholdersIncludingParticipatingSecurities	-31845000	USD
	ofc	Net Income Loss Available To Common Stockholders Including Participating Securities NetIncomeLossAvailableToCommonStockholdersIncludingParticipatingSecurities	62833000	USD
	ofc	Net Income Loss Available To Common Stockholders Including Participating Securities NetIncomeLossAvailableToCommonStockholdersIncludingParticipatingSecurities	15706000	USD
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.24
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.29
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.14
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.29
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2021Q3	us-gaap	Profit Loss ProfitLoss	28794000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	-31342000	USD
	us-gaap	Profit Loss ProfitLoss	66613000	USD
	us-gaap	Profit Loss ProfitLoss	19329000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-118000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1428000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	426000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-39592000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-1226000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-1342000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-3604000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-2408000	USD
CY2021Q3	ofc	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuanceafter Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceafterTax	0	USD
CY2020Q3	ofc	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuanceafter Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceafterTax	-51865000	USD
	ofc	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuanceafter Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceafterTax	0	USD
	ofc	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuanceafter Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceafterTax	-51865000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1108000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	54635000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4030000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	14681000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	29902000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	23293000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	70643000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	34010000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1733000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1173000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	4000000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3408000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	28169000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	22120000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	66643000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	30602000	USD
CY2020Q2	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112183192	shares
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1656924000	USD
CY2020Q3	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	-7504	shares
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1784000	USD
CY2020Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	57000	USD
CY2020Q3	ofc	Noncontrolling Interest Increase Decrease From Changes In Ownership NoncontrollingInterestIncreaseDecreaseFromChangesInOwnership	0	USD
CY2020Q3	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	22653000	USD
CY2020Q3	us-gaap	Dividends Dividends	30843000	USD
CY2020Q3	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	444000	USD
CY2020Q3	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	7000	USD
CY2020Q3	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-374000	USD
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112175688	shares
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1649636000	USD
CY2021Q2	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112336070	shares
CY2021Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1671312000	USD
CY2021Q3	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	56000	USD
CY2021Q3	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	-10659	shares
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2162000	USD
CY2021Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	64000	USD
CY2021Q3	ofc	Noncontrolling Interest Increase Decrease From Changes In Ownership NoncontrollingInterestIncreaseDecreaseFromChangesInOwnership	0	USD
CY2021Q3	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	28769000	USD
CY2021Q3	us-gaap	Dividends Dividends	30883000	USD
CY2021Q3	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	398000	USD
CY2021Q3	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	8000	USD
CY2021Q3	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-55000	USD
CY2021Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112325411	shares
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1670779000	USD
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112068705	shares
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1719245000	USD
	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	12009	shares
	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	94974	shares
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4730000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1629000	USD
	ofc	Noncontrolling Interest Increase Decrease From Changes In Ownership NoncontrollingInterestIncreaseDecreaseFromChangesInOwnership	0	USD
	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	31295000	USD
	us-gaap	Dividends Dividends	92537000	USD
	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	1306000	USD
	ofc	Minority Interest Increase From Contributions Including Joint Ventures MinorityInterestIncreaseFromContributionsIncludingJointVentures	112000	USD
	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	22000	USD
	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-4711000	USD
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112175688	shares
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1649636000	USD
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112181759	shares
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1693712000	USD
	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	8054	shares
	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	297000	USD
	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	135598	shares
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6322000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	2422000	USD
	ofc	Noncontrolling Interest Increase Decrease From Changes In Ownership NoncontrollingInterestIncreaseDecreaseFromChangesInOwnership	0	USD
	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	68357000	USD
	us-gaap	Dividends Dividends	92673000	USD
	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	1196000	USD
	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	23000	USD
	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-677000	USD
	ofc	Other Adjustment OtherAdjustment	324000	USD
CY2021Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	112325411	shares
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1670779000	USD
	ofc	Revenues From Real Estate Operations Received RevenuesFromRealEstateOperationsReceived	427448000	USD
	ofc	Revenues From Real Estate Operations Received RevenuesFromRealEstateOperationsReceived	394094000	USD
	ofc	Construction Contract And Other Service Revenues Received ConstructionContractAndOtherServiceRevenuesReceived	68780000	USD
	ofc	Construction Contract And Other Service Revenues Received ConstructionContractAndOtherServiceRevenuesReceived	53911000	USD
	ofc	Property Operating Expenses Paid PropertyOperatingExpensesPaid	168009000	USD
	ofc	Property Operating Expenses Paid PropertyOperatingExpensesPaid	159007000	USD
	ofc	Construction Contract And Other Service Expenses Paid ConstructionContractAndOtherServiceExpensesPaid	50275000	USD
	ofc	Construction Contract And Other Service Expenses Paid ConstructionContractAndOtherServiceExpensesPaid	45686000	USD
	ofc	Generaland Administrative Leasing Business Developmentand Land Carry Paid GeneralandAdministrativeLeasingBusinessDevelopmentandLandCarryPaid	22367000	USD
	ofc	Generaland Administrative Leasing Business Developmentand Land Carry Paid GeneralandAdministrativeLeasingBusinessDevelopmentandLandCarryPaid	24408000	USD
	us-gaap	Interest Paid Net InterestPaidNet	46621000	USD
	us-gaap	Interest Paid Net InterestPaidNet	49693000	USD
	ofc	Paymentsof Lease Incentives PaymentsofLeaseIncentives	8694000	USD
	ofc	Paymentsof Lease Incentives PaymentsofLeaseIncentives	12634000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-359000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	2464000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	199903000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	159041000	USD
	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	176554000	USD
	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	284416000	USD
	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	15149000	USD
	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	23377000	USD
	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	19256000	USD
	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	24797000	USD
	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	114050000	USD
	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	USD
	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	872000	USD
	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	2287000	USD
	us-gaap	Payments For Leasing Costs PaymentsForLeasingCosts	14929000	USD
	us-gaap	Payments For Leasing Costs PaymentsForLeasingCosts	12455000	USD
	us-gaap	Payments For Derivative Instrument Investing Activities PaymentsForDerivativeInstrumentInvestingActivities	0	USD
	us-gaap	Payments For Derivative Instrument Investing Activities PaymentsForDerivativeInstrumentInvestingActivities	53130000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1026000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	321000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-111992000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-396209000	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	456000000	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	409000000	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	987210000	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	395264000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	4630000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	199088000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	589000000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	529000000	USD
	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	600000000	USD
	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	122948000	USD
	ofc	Scheduled Principal Amortization Repayments Of Long Term Debt ScheduledPrincipalAmortizationRepaymentsOfLongTermDebt	2911000	USD
	ofc	Scheduled Principal Amortization Repayments Of Long Term Debt ScheduledPrincipalAmortizationRepaymentsOfLongTermDebt	3077000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	188960000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	0	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2662000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2161000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	55720000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	3037000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	92632000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	92512000	USD
	ofc	Paymentsof Distributions Redeemable Noncontrolling Interest PaymentsofDistributionsRedeemableNoncontrollingInterest	1687000	USD
	ofc	Paymentsof Distributions Redeemable Noncontrolling Interest PaymentsofDistributionsRedeemableNoncontrollingInterest	13515000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2422000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1629000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3645000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1760000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-91799000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	233713000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3888000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3455000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22033000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18130000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18145000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	14675000	USD
	us-gaap	Profit Loss ProfitLoss	66613000	USD
	us-gaap	Profit Loss ProfitLoss	19329000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	113676000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	102864000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1530000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3969000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3104000	USD
	us-gaap	Straight Line Rent StraightLineRent	13515000	USD
	us-gaap	Straight Line Rent StraightLineRent	3560000	USD
	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	39711000	USD
	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	5000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5960000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4753000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-59553000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3237000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-53196000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	3708000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	4184000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6269000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	744000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	13120000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	13164000	USD
	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	15250000	USD
	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	-3971000	USD
	ofc	Increase Decrease In Advance Rent And Security Deposit Liability IncreaseDecreaseInAdvanceRentAndSecurityDepositLiability	-1333000	USD
	ofc	Increase Decrease In Advance Rent And Security Deposit Liability IncreaseDecreaseInAdvanceRentAndSecurityDepositLiability	-3344000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	199903000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	159041000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	18369000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	14733000	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	3664000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	3397000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22033000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18130000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	14570000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11458000	USD
CY2021Q3	us-gaap	Restricted Cash RestrictedCash	3575000	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	3217000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18145000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	14675000	USD
	ofc	Increase Decrease In Accrued Capital Improvements Leasing And Other Investing Activity Costs IncreaseDecreaseInAccruedCapitalImprovementsLeasingAndOtherInvestingActivityCosts	17590000	USD
	ofc	Increase Decrease In Accrued Capital Improvements Leasing And Other Investing Activity Costs IncreaseDecreaseInAccruedCapitalImprovementsLeasingAndOtherInvestingActivityCosts	-195000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	328000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	8955000	USD
	ofc	Increasein Investmentin Unconsolidated Real Estate Joint Venturein Connection With Partial Saleof Properties IncreaseinInvestmentinUnconsolidatedRealEstateJointVentureinConnectionWithPartialSaleofProperties	11842000	USD
	ofc	Increasein Investmentin Unconsolidated Real Estate Joint Venturein Connection With Partial Saleof Properties IncreaseinInvestmentinUnconsolidatedRealEstateJointVentureinConnectionWithPartialSaleofProperties	0	USD
	ofc	Increase Decrease In Fair Value Of Derivatives Applied To Aocl And Noncontrolling Interests IncreaseDecreaseInFairValueOfDerivativesAppliedToAoclAndNoncontrollingInterests	4030000	USD
	ofc	Increase Decrease In Fair Value Of Derivatives Applied To Aocl And Noncontrolling Interests IncreaseDecreaseInFairValueOfDerivativesAppliedToAoclAndNoncontrollingInterests	-37183000	USD
CY2021Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	31306000	USD
CY2020Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	31307000	USD
	ofc	Equity Change Stock Issued During Period Value Conversion Of Units EquityChangeStockIssuedDuringPeriodValueConversionOfUnits	121000	USD
	ofc	Equity Change Stock Issued During Period Value Conversion Of Units EquityChangeStockIssuedDuringPeriodValueConversionOfUnits	182000	USD
	ofc	Equity Change Adjustments To Additional Paid In Capital Reallocation Of Minority Interest EquityChangeAdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest	-1245000	USD
	ofc	Equity Change Adjustments To Additional Paid In Capital Reallocation Of Minority Interest EquityChangeAdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest	-527000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	677000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	4711000	USD
	us-gaap	Nature Of Operations NatureOfOperations	Organization<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Corporate Office Properties Trust (“COPT”) and subsidiaries (collectively, the “Company”, “we” or “us”) is a fully-integrated and self-managed real estate investment trust (“REIT”). 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 September 30, 2021, our properties included the following:</span></div><div style="padding-left:18pt"><span><br/></span></div><div style="padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">186 properties totaling 21.7 million square feet comprised of 16.9 million square feet in 160 office properties and 4.7 million square feet in 26 single-tenant data center shell properties (“data center shells”). We owned 19 of these data center shells through unconsolidated real estate joint ventures;</span></div><div style="padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">a wholesale data center with a capacity of 19.25 megawatts;</span></div><div style="padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">13 properties under development (10 office properties and three data center shells), including three partially-operational properties, that we estimate will total approximately 1.8 million square feet upon completion; and</span></div><div style="padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">approximately 720 acres of land controlled for future development that we believe could be developed into approximately 8.9 million square feet and 43 acres of other land.</span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We conduct almost all of our operations and own almost all of our assets through our operating partnership, Corporate Office Properties, L.P. (“COPLP”) and subsidiaries (collectively, the “Operating Partnership”), of which COPT is the sole general partner. 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="text-indent:18pt"><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Equity interests in COPLP are in the form of common and preferred units. As of September 30, 2021, COPT owned 98.3% of the outstanding COPLP common units (“common units”) and there were no preferred units outstanding. 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.</span></div>COPT’s common shares are publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “OFC”.
CY2021Q3	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	114309000	USD
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Reclassifications</span></div><div><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We reclassified certain amounts from the prior period to conform to the current period presentation of our consolidated financial statements with no effect on previously reported net income or equity.</span></div>
CY2020Q3	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	106743000	USD
	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	340157000	USD
	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	314845000	USD
CY2021Q3	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	31440000	USD
CY2020Q3	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	27132000	USD
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	93874000	USD
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	82189000	USD
CY2021Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	145749000	USD
CY2020Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	133875000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	434031000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	397034000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	2484161000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3403000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	109800000	USD
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Remainder Of Fiscal Year SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear	221000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	418746000	USD
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Next Twelve Months SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths	960000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	370652000	USD
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	960000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	323198000	USD
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	960000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	241090000	USD
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	960000	USD
CY2021Q3	ofc	Lessor Operating Lease Paymenttobe Receivedafter Year Four LessorOperatingLeasePaymenttobeReceivedafterYearFour	1020675000	USD
CY2021Q3	ofc	Sales Type And Direct Financing Leases Lease Receivable To Be Received After Year Four SalesTypeAndDirectFinancingLeasesLeaseReceivableToBeReceivedAfterYearFour	4516000	USD
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	8577000	USD
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	2277000	USD
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	6300000	USD
CY2021Q3	ofc	Lessee Rightof Use Asset LesseeRightofUseAsset	78900000	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	38854000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	40570000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	40077000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	40425000	USD
CY2021Q3	ofc	Lease Rightof Use Assets LeaseRightofUseAssets	78931000	USD
CY2020Q4	ofc	Lease Rightof Use Assets LeaseRightofUseAssets	80995000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	29630000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	30746000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	14000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	28000	USD
CY2021Q3	ofc	Lease Liabilities LeaseLiabilities	29644000	USD
CY2020Q4	ofc	Lease Liabilities LeaseLiabilities	30774000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P51Y
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0716
CY2021Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0362
CY2021Q3	us-gaap	Lease Cost LeaseCost	1029000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	714000	USD
	us-gaap	Lease Cost LeaseCost	3053000	USD
	us-gaap	Lease Cost LeaseCost	1608000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	2399000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	987000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	14000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	674000	USD
CY2021Q3	ofc	Lessee Lease Liability Payments Due Year Three LesseeLeaseLiabilityPaymentsDueYearThree	3403000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	807000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	0	USD
CY2021Q3	ofc	Lessee Lease Liability Payments Remainderof Fiscal Year LesseeLeaseLiabilityPaymentsRemainderofFiscalYear	807000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3297000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	14000	USD
CY2021Q3	ofc	Lessee Lease Liability Payments Due Year One LesseeLeaseLiabilityPaymentsDueYearOne	3311000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3352000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	0	USD
CY2021Q3	ofc	Lessee Lease Liability Payments Due Year Two LesseeLeaseLiabilityPaymentsDueYearTwo	3352000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	0	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1749000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2021Q3	ofc	Lessee Lease Liability Payments Due Year Four LesseeLeaseLiabilityPaymentsDueYearFour	1749000	USD
CY2021Q3	ofc	Lessee Operating Lease Liabilitytobe Paidafter Year Four LesseeOperatingLeaseLiabilitytobePaidafterYearFour	123979000	USD
CY2021Q3	ofc	Finance Lease Liability Payments Due After Year Four FinanceLeaseLiabilityPaymentsDueAfterYearFour	0	USD
CY2021Q3	ofc	Lessee Lease Liability Payments Dueafter Year Four LesseeLeaseLiabilityPaymentsDueafterYearFour	123979000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	136587000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	14000	USD
CY2021Q3	ofc	Lessee Lease Liability Payments Due LesseeLeaseLiabilityPaymentsDue	136601000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	106957000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	0	USD
CY2021Q3	ofc	Lessee Lease Liability Imputed Interest LesseeLeaseLiabilityImputedInterest	106957000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	29630000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	14000	USD
CY2021Q3	ofc	Lease Liabilities LeaseLiabilities	29644000	USD
CY2021Q3	us-gaap	Long Term Debt LongTermDebt	2159732000	USD
CY2021Q3	us-gaap	Incentive To Lessee IncentiveToLessee	40150000	USD
CY2020Q4	us-gaap	Incentive To Lessee IncentiveToLessee	35642000	USD
CY2021Q3	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	26815000	USD
CY2020Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	19690000	USD
CY2021Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	12987000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	10343000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10008000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10433000	USD
CY2021Q3	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	6300000	USD
CY2020Q4	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	6573000	USD
CY2021Q3	ofc	Nonreal Estate Equity Investments NonrealEstateEquityInvestments	5545000	USD
CY2020Q4	ofc	Nonreal Estate Equity Investments NonrealEstateEquityInvestments	5509000	USD
CY2021Q3	us-gaap	Restricted Cash RestrictedCash	3575000	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	3664000	USD
CY2021Q3	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	2616000	USD
CY2020Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	3027000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1883000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1989000	USD
CY2021Q3	ofc	Deferred Financingand Derivative Costs DeferredFinancingandDerivativeCosts	1595000	USD
CY2020Q4	ofc	Deferred Financingand Derivative Costs DeferredFinancingandDerivativeCosts	2439000	USD
CY2021Q3	us-gaap	Other Assets OtherAssets	5740000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	5274000	USD
CY2021Q3	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	117214000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	104583000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	2086918000	USD
CY2021Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1800000	USD
CY2020Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2900000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	5300000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	9400000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-118000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1428000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	426000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-39592000	USD
	ofc	Numberof Joint Ventures With Redeemable Noncontrolling Interests NumberofJointVenturesWithRedeemableNoncontrollingInterests	2	joint_venture
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.275
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	25430000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	29431000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	2387000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	13335000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	2286000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	2715000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	677000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	4711000	USD
CY2021Q3	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	26006000	USD
CY2020Q3	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	23522000	USD
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.275
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.825
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.825
CY2020Q4	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLoss	4697000	USD
	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	-1040000	USD
CY2021Q3	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLoss	3657000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	28046000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20323000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	64592000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	46240000	USD
CY2021Q3	us-gaap	Revenues Revenues	174636000	USD
CY2020Q3	us-gaap	Revenues Revenues	154766000	USD
	us-gaap	Revenues Revenues	500769000	USD
	us-gaap	Revenues Revenues	445337000	USD
CY2021Q3	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	1060000	USD
CY2020Q3	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	1752000	USD
	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	2950000	USD
	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	5190000	USD
CY2021Q3	ofc	Income Lossfrom Equity Method Investments Allocableto Depreciation Amortizationand Interest Expense IncomeLossfromEquityMethodInvestmentsAllocabletoDepreciationAmortizationandInterestExpense	763000	USD
CY2020Q3	ofc	Income Lossfrom Equity Method Investments Allocableto Depreciation Amortizationand Interest Expense IncomeLossfromEquityMethodInvestmentsAllocabletoDepreciationAmortizationandInterestExpense	1274000	USD
	ofc	Income Lossfrom Equity Method Investments Allocableto Depreciation Amortizationand Interest Expense IncomeLossfromEquityMethodInvestmentsAllocabletoDepreciationAmortizationandInterestExpense	2167000	USD
	ofc	Income Lossfrom Equity Method Investments Allocableto Depreciation Amortizationand Interest Expense IncomeLossfromEquityMethodInvestmentsAllocabletoDepreciationAmortizationandInterestExpense	3814000	USD
CY2021Q3	ofc	Income Lossin Non Real Estate Equity Method Investments IncomeLossinNonRealEstateEquityMethodInvestments	0	USD
CY2020Q3	ofc	Income Lossin Non Real Estate Equity Method Investments IncomeLossinNonRealEstateEquityMethodInvestments	-1000	USD
	ofc	Income Lossin Non Real Estate Equity Method Investments IncomeLossinNonRealEstateEquityMethodInvestments	-4000	USD
	ofc	Income Lossin Non Real Estate Equity Method Investments IncomeLossinNonRealEstateEquityMethodInvestments	-4000	USD
CY2021Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	297000	USD
CY2020Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	477000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	779000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1372000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	28046000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20323000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	64592000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	46240000	USD
CY2021Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	27089000	USD
CY2020Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	19220000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	61964000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	44052000	USD
CY2021Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1818000	USD
CY2020Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1746000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	5911000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	5233000	USD
CY2021Q3	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	-326000	USD
CY2020Q3	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	-1465000	USD
	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	-1040000	USD
	ofc	Credit Losses Financial Assetsand Other Instruments Allowancefor Credit Loss Expense Reversal CreditLossesFinancialAssetsandOtherInstrumentsAllowanceforCreditLossExpenseReversal	-161000	USD
CY2021Q3	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-32000	USD
CY2020Q3	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	0	USD
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	39711000	USD
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	5000	USD
CY2021Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	297000	USD
CY2020Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	477000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	779000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1372000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	103000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	95000	USD
CY2021Q3	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	36611000	USD
CY2020Q3	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	35332000	USD
	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	111487000	USD
	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	101540000	USD
CY2021Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1530000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1530000	USD
CY2021Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	9342000	USD
CY2020Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	7467000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	26970000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	23111000	USD
CY2021Q3	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	1093000	USD
CY2020Q3	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	1094000	USD
	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	3559000	USD
	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	3474000	USD
CY2021Q3	us-gaap	Interest Expense InterestExpense	15720000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	17152000	USD
	us-gaap	Interest Expense InterestExpense	49181000	USD
	us-gaap	Interest Expense InterestExpense	50789000	USD
CY2021Q3	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	1060000	USD
CY2020Q3	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	1752000	USD
	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	2950000	USD
	ofc	Unconsolidated Joint Venture Net Operating Income Allocableto Parent UnconsolidatedJointVentureNetOperatingIncomeAllocabletoParent	5190000	USD
CY2021Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1159000	USD
CY2020Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3237000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-59553000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3237000	USD
CY2021Q3	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
CY2020Q3	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-53196000	USD
	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-53196000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	28794000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	-31342000	USD
	us-gaap	Profit Loss ProfitLoss	66613000	USD
	us-gaap	Profit Loss ProfitLoss	19329000	USD
CY2021Q3	us-gaap	Assets Assets	4151138000	USD
CY2020Q3	us-gaap	Assets Assets	4120189000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	28046000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20323000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	64592000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	46240000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	28046000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20323000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	64592000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	46240000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	27101000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-31845000	USD
	us-gaap	Net Income Loss NetIncomeLoss	62833000	USD
	us-gaap	Net Income Loss NetIncomeLoss	15706000	USD
CY2021Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	92000	USD
CY2020Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	145000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	337000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	365000	USD
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	27009000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-31990000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	62496000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15341000	USD
CY2021Q3	ofc	Dilutive Securities Effecton Basic Earnings Per Share Dilutive Redeemable Noncontrolling Interests DilutiveSecuritiesEffectonBasicEarningsPerShareDilutiveRedeemableNoncontrollingInterests	-89000	USD
CY2020Q3	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	-82000	USD
	ofc	Dilutive Securities Effecton Basic Earnings Per Share Dilutive Redeemable Noncontrolling Interests DilutiveSecuritiesEffectonBasicEarningsPerShareDilutiveRedeemableNoncontrollingInterests	0	USD
CY2021Q3	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	13000	USD
CY2020Q3	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	0	USD
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	17000	USD
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	6000	USD
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	26933000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-31990000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	62431000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	15347000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111985000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111811000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111949000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111778000	shares
CY2021Q3	ofc	Incremental Common Shares Attributableto Dilutive Effectof Redeemable Noncontrolling Interests IncrementalCommonSharesAttributabletoDilutiveEffectofRedeemableNoncontrollingInterests	138000	shares
CY2020Q3	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
	ofc	Incremental Common Shares Attributableto Dilutive Effectof Redeemable Noncontrolling Interests IncrementalCommonSharesAttributabletoDilutiveEffectofRedeemableNoncontrollingInterests	0	shares
CY2021Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	375000	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	285000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	278000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112498000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111811000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112364000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112056000	shares
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.24
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.29
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.14
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.29
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2021Q3	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	3400000	USD
CY2021Q3	ofc	Property Subjectto Environmental Indemnity Numberof Properties PropertySubjecttoEnvironmentalIndemnityNumberofProperties	3	Property
CY2021Q3	ofc	Maximum Additional Costs Agreed To Be Paid By The Entity Under Environmental Indemnification Agreement MaximumAdditionalCostsAgreedToBePaidByTheEntityUnderEnvironmentalIndemnificationAgreement	19000000	USD

Files In Submission

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0000860546-21-000051.txt	Edgar Link	pending
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$CDP
COPT Defense Properties Stock $cdp

2021 Q4 Form 10-Q Financial Statement

#000086054621000051 Filed on November 01, 2021

Income Statement

Balance Sheet

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$CDP COPT Defense Properties Stock $cdp

2021 Q4 Form 10-Q Financial Statement

#000086054621000051 Filed on November 01, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CDP
COPT Defense Properties Stock $cdp