$CDP
COPT Defense Properties Stock $cdp

$cdp Overview Financials Valuation SEC Filings Company Website

2015 Q4 Form 10-Q Financial Statement

#000086054615000047 Filed on November 04, 2015

Income Statement

Concept	2015 Q4	2015 Q3	2014 Q3
Revenue	$143.3M	$150.7M	$153.0M
YoY Change	-2.48%	-1.48%	16.09%
Cost Of Revenue	$56.30M	$16.13M	$33.59M
YoY Change	-17.21%	-51.98%	106.02%
Gross Profit	$87.10M	$134.6M	$119.4M
YoY Change	10.39%	12.72%	3.39%
Gross Profit Margin	60.77%	89.3%	78.05%
Selling, General & Admin	$8.500M	$7.439M	$7.211M
YoY Change	-4.49%	3.16%	-10.17%
% of Gross Profit	9.76%	5.53%	6.04%
Research & Development	$2.500M	$5.600M	$1.400M
YoY Change	66.67%	300.0%	0.0%
% of Gross Profit	2.87%	4.16%	1.17%
Depreciation & Amortization	$36.80M	$39.00M	$30.80M
YoY Change	15.36%	26.62%	3.36%
% of Gross Profit	42.25%	28.97%	25.79%
Operating Expenses	$47.30M	$7.439M	$7.211M
YoY Change	13.43%	3.16%	-10.17%
Operating Profit	$20.06M	$31.99M	$37.42M
YoY Change	-46.01%	-14.51%	22.0%
Interest Expense	-$21.00M	-$23.40M	-$23.40M
YoY Change	-4.98%	0.0%	21.24%
% of Operating Profit	-104.71%	-73.14%	-62.53%
Other Income/Expense, Net
YoY Change
Pretax Income	-$1.400M	$94.31M	$13.64M
YoY Change	-123.73%	591.67%	24.48%
Income Tax	$0.00	$48.00K	$101.0K
% Of Pretax Income		0.05%	0.74%
Net Earnings	$59.36M	$89.80M	$22.72M
YoY Change	1110.52%	295.25%	-866.53%
Net Earnings / Revenue	41.42%	59.57%	14.85%
Basic Earnings Per Share	$0.59	$0.91	$0.22
Diluted Earnings Per Share	$0.59	$0.91	$0.22
COMMON SHARES
Basic Shares Outstanding	94.53M shares	94.15M shares	87.29M shares
Diluted Shares Outstanding		94.61M shares	87.49M shares

Balance Sheet

Concept	2015 Q4	2015 Q3	2014 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$60.30M	$3.800M	$40.00M
YoY Change	888.52%	-90.5%	46.52%
Cash & Equivalents	$60.31M	$3.840M	$40.02M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory	$96.80M	$150.6M
Prepaid Expenses
Receivables	$29.20M	$20.00M	$20.20M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$186.3M	$174.4M	$60.20M
YoY Change	264.58%	189.7%	-66.37%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.004M	$5.941M	$6.527M
YoY Change	-9.54%	-8.98%	-2.65%
Goodwill
YoY Change
Intangibles	$98.34M	$106.2M	$48.30M
YoY Change	124.24%	119.82%	-24.97%
Long-Term Investments	$1.636M	$1.626M	$2.240M
YoY Change	-30.91%	-27.41%	-54.55%
Other Assets	$93.90M	$106.3M	$107.9M
YoY Change	1.62%	-1.48%	0.19%
Total Long-Term Assets	$3.723B	$3.738B	$3.620B
YoY Change	3.04%	3.25%	1.21%
TOTAL ASSETS
Total Short-Term Assets	$186.3M	$174.4M	$60.20M
Total Long-Term Assets	$3.723B	$3.738B	$3.620B
Total Assets	$3.909B	$3.912B	$3.680B
YoY Change	6.69%	6.3%	-2.01%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$91.80M	$98.60M	$123.9M
YoY Change	-25.37%	-20.42%	45.25%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$159.1M	$163.3M	$185.3M
YoY Change	-13.49%	-11.87%	29.67%
LONG-TERM LIABILITIES
Long-Term Debt	$2.078B	$2.121B	$2.050B
YoY Change	8.56%	3.47%	-3.98%
Other Long-Term Liabilities	$36.70M	$34.50M	$28.90M
YoY Change	35.93%	19.38%	7.84%
Total Long-Term Liabilities	$2.115B	$2.156B	$2.079B
YoY Change	8.94%	3.69%	-3.83%
TOTAL LIABILITIES
Total Short-Term Liabilities	$159.1M	$163.3M	$185.3M
Total Long-Term Liabilities	$2.115B	$2.156B	$2.079B
Total Liabilities	$2.274B	$2.319B	$2.264B
YoY Change	6.99%	2.42%	-1.76%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$945.0K	$945.0K	$877.0K
YoY Change	1.29%	7.75%	0.34%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.545B	$1.510B	$1.330B
YoY Change
Total Liabilities & Shareholders Equity	$3.909B	$3.918B	$3.680B
YoY Change	6.69%	6.47%	-2.01%

Cashflow Statement

Concept	2015 Q4	2015 Q3	2014 Q3
OPERATING ACTIVITIES
Net Income	$59.36M	$89.80M	$22.72M
YoY Change	1110.52%	295.25%	-866.53%
Depreciation, Depletion And Amortization	$36.80M	$39.00M	$30.80M
YoY Change	15.36%	26.62%	3.36%
Cash From Operating Activities	$56.30M	$24.90M	$41.20M
YoY Change	13.28%	-39.56%	-9.45%
INVESTING ACTIVITIES
Capital Expenditures	-$81.80M	-$134.7M	-$57.00M
YoY Change	23.38%	136.32%	-16.42%
Acquisitions
YoY Change
Other Investing Activities	$145.4M	$24.50M	$60.00M
YoY Change	-2445.16%	-59.17%	-1918.18%
Cash From Investing Activities	$63.80M	-$110.3M	$3.000M
YoY Change	-187.76%	-3776.67%	-104.2%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-63.50M	52.10M	-80.50M
YoY Change	482.57%	-164.72%	-282.13%
NET CHANGE
Cash From Operating Activities	56.30M	24.90M	41.20M
Cash From Investing Activities	63.80M	-110.3M	3.000M
Cash From Financing Activities	-63.50M	52.10M	-80.50M
Net Change In Cash	56.60M	-33.30M	-36.30M
YoY Change	-266.96%	-8.26%	-299.45%
FREE CASH FLOW
Cash From Operating Activities	$56.30M	$24.90M	$41.20M
Capital Expenditures	-$81.80M	-$134.7M	-$57.00M
Free Cash Flow	$138.1M	$159.6M	$98.20M
YoY Change	19.05%	62.53%	-13.63%

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
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
	dei	Document Period End Date DocumentPeriodEndDate	2015-09-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0000860546
CY2015Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	94533250	shares
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	CORPORATE OFFICE PROPERTIES TRUST
CY2015Q3	ofc	Additional Costs Incurred Related To Construction And Environmental Regulatory Activities Maximum Per Annum AdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivitiesMaximumPerAnnum	300000	USD
CY2015Q3	ofc	Additional Costs Incurred Related To Construction And Environmental Regulatory Activities Percentage AdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivitiesPercentage	0.5
	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-7000	USD
	ofc	Adjustmentto Equityto Arriveat Fair Valueof Redeemable Noncontrolling Interest AdjustmenttoEquitytoArriveatFairValueofRedeemableNoncontrollingInterest	-599000	USD
CY2014Q4	ofc	Advance Rent And Security Deposit Liability AdvanceRentAndSecurityDepositLiability	31011000	USD
CY2015Q3	ofc	Advance Rent And Security Deposit Liability AdvanceRentAndSecurityDepositLiability	34504000	USD
CY2014Q4	ofc	Allowancefor Doubtful Accounts Deferred Rent AllowanceforDoubtfulAccountsDeferredRent	1418000	USD
CY2015Q3	ofc	Allowancefor Doubtful Accounts Deferred Rent AllowanceforDoubtfulAccountsDeferredRent	1816000	USD
CY2014Q3	ofc	Amount Of Dilutive Effect Of Common Units On Diluted Earnings Per Share From Continuing Operations AmountOfDilutiveEffectOfCommonUnitsOnDilutedEarningsPerShareFromContinuingOperations	0	USD
	ofc	Amount Of Dilutive Effect Of Common Units On Diluted Earnings Per Share From Continuing Operations AmountOfDilutiveEffectOfCommonUnitsOnDilutedEarningsPerShareFromContinuingOperations	0	USD
CY2015Q3	ofc	Amount Of Dilutive Effect Of Common Units On Diluted Earnings Per Share From Continuing Operations AmountOfDilutiveEffectOfCommonUnitsOnDilutedEarningsPerShareFromContinuingOperations	0	USD
	ofc	Amount Of Dilutive Effect Of Common Units On Diluted Earnings Per Share From Continuing Operations AmountOfDilutiveEffectOfCommonUnitsOnDilutedEarningsPerShareFromContinuingOperations	4225000	USD
CY2014Q3	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	1430000	USD
	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	4107000	USD
CY2015Q3	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	5573000	USD
	ofc	Business Development Expenses And Land Carry Costs BusinessDevelopmentExpensesAndLandCarryCosts	10986000	USD
	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	35055000	USD
	ofc	Comprehensive Income Loss Net Of Tax After Redeemable Noncontrolling Interest Adjustments ComprehensiveIncomeLossNetOfTaxAfterRedeemableNoncontrollingInterestAdjustments	120044000	USD
CY2014Q3	ofc	Construction Contract And Other Service Expenses ConstructionContractAndOtherServiceExpenses	33593000	USD
	ofc	Construction Contract And Other Service Expenses ConstructionContractAndOtherServiceExpenses	75353000	USD
CY2015Q3	ofc	Construction Contract And Other Service Expenses ConstructionContractAndOtherServiceExpenses	16132000	USD
CY2015Q3	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	3347600000	USD
CY2014Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	118240000	USD
	ofc	Construction Contract And Other Service Expenses ConstructionContractAndOtherServiceExpenses	94923000	USD
	ofc	Construction Contract And Other Service Expenses Paid ConstructionContractAndOtherServiceExpensesPaid	58218000	USD
	ofc	Construction Contract And Other Service Expenses Paid ConstructionContractAndOtherServiceExpensesPaid	112614000	USD
	ofc	Construction Contract And Other Service Revenues Received ConstructionContractAndOtherServiceRevenuesReceived	62170000	USD
	ofc	Construction Contract And Other Service Revenues Received ConstructionContractAndOtherServiceRevenuesReceived	104817000	USD
	ofc	Decrease In Debt In Connection With Surrender Of Property In Settlement Of Debt DecreaseInDebtInConnectionWithSurrenderOfPropertyInSettlementOfDebt	0	USD
	ofc	Decrease In Debt In Connection With Surrender Of Property In Settlement Of Debt DecreaseInDebtInConnectionWithSurrenderOfPropertyInSettlementOfDebt	150000000	USD
	ofc	Decreasein Propertyin Connectionwith Surrender Property Debt Settlement DecreaseinPropertyinConnectionwithSurrenderPropertyDebtSettlement	0	USD
	ofc	Decreasein Propertyin Connectionwith Surrender Property Debt Settlement DecreaseinPropertyinConnectionwithSurrenderPropertyDebtSettlement	82738000	USD
CY2014Q3	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	30237000	USD
	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	104728000	USD
CY2015Q3	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	38403000	USD
	ofc	Depreciation And Amortization For Real Estate Operations DepreciationAndAmortizationForRealEstateOperations	103788000	USD
	ofc	Dilutive Securities Effectof Common Units DilutiveSecuritiesEffectofCommonUnits	0	USD
CY2015Q3	ofc	Dilutive Securities Effectof Common Units DilutiveSecuritiesEffectofCommonUnits	0	USD
	ofc	Dilutive Securities Effectof Common Units DilutiveSecuritiesEffectofCommonUnits	4231000	USD
CY2014Q3	ofc	Disposal Group Including Discontinued Operation Operating Income Loss Excluding Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLossExcludingDepreciationAndAmortization	-139000	USD
	ofc	Disposal Group Including Discontinued Operation Operating Income Loss Excluding Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLossExcludingDepreciationAndAmortization	-99000	USD
CY2015Q3	ofc	Disposal Group Including Discontinued Operation Operating Income Loss Excluding Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLossExcludingDepreciationAndAmortization	0	USD
	ofc	Disposal Group Including Discontinued Operation Operating Income Loss Excluding Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLossExcludingDepreciationAndAmortization	-10000	USD
CY2014Q3	ofc	Disposal Group Including Discontinued Operation Property Operating Expense DisposalGroupIncludingDiscontinuedOperationPropertyOperatingExpense	175000	USD
	ofc	Disposal Group Including Discontinued Operation Property Operating Expense DisposalGroupIncludingDiscontinuedOperationPropertyOperatingExpense	111000	USD
CY2015Q3	ofc	Disposal Group Including Discontinued Operation Property Operating Expense DisposalGroupIncludingDiscontinuedOperationPropertyOperatingExpense	0	USD
	ofc	Disposal Group Including Discontinued Operation Property Operating Expense DisposalGroupIncludingDiscontinuedOperationPropertyOperatingExpense	6000	USD
CY2015Q3	ofc	Environmental Indemnification To Tenant Against Consequential Damages After Acquisition Of Property Maximum EnvironmentalIndemnificationToTenantAgainstConsequentialDamagesAfterAcquisitionOfPropertyMaximum	12500000.0	USD
CY2015Q3	ofc	Environmental Indemnification To Tenant Against Losses Covered Under Prior Owner Indemnity Agreement Maximum EnvironmentalIndemnificationToTenantAgainstLossesCoveredUnderPriorOwnerIndemnityAgreementMaximum	5000000.0	USD
	ofc	Equity Change Adjustments To Additional Paid In Capital Reallocation Of Minority Interest EquityChangeAdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest	248000	USD
	ofc	Equity Change Adjustments To Additional Paid In Capital Reallocation Of Minority Interest EquityChangeAdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest	591000	USD
	ofc	Equity Change Stock Issued During Period Value Conversion Of Units EquityChangeStockIssuedDuringPeriodValueConversionOfUnits	1545000	USD
	ofc	Equity Change Stock Issued During Period Value Conversion Of Units EquityChangeStockIssuedDuringPeriodValueConversionOfUnits	2151000	USD
	ofc	Extinguishmentof Debt Noncash Gain Loss ExtinguishmentofDebtNoncashGainLoss	458000	USD
	ofc	Extinguishmentof Debt Noncash Gain Loss ExtinguishmentofDebtNoncashGainLoss	-86075000	USD
	ofc	General And Administrative And Leasing And Business Development Expenses Paid GeneralAndAdministrativeAndLeasingAndBusinessDevelopmentExpensesPaid	22288000	USD
	ofc	General And Administrative And Leasing And Business Development Expenses Paid GeneralAndAdministrativeAndLeasingAndBusinessDevelopmentExpensesPaid	29620000	USD
	ofc	Increase Decrease In Accrued Capital Improvements Leasing And Other Investing Activity Costs IncreaseDecreaseInAccruedCapitalImprovementsLeasingAndOtherInvestingActivityCosts	-174000	USD
	ofc	Increase Decrease In Accrued Capital Improvements Leasing And Other Investing Activity Costs IncreaseDecreaseInAccruedCapitalImprovementsLeasingAndOtherInvestingActivityCosts	-11722000	USD
	ofc	Increase Decrease In Advance Rent And Security Deposit Liability IncreaseDecreaseInAdvanceRentAndSecurityDepositLiability	1583000	USD
	ofc	Increase Decrease In Advance Rent And Security Deposit Liability IncreaseDecreaseInAdvanceRentAndSecurityDepositLiability	3763000	USD
	ofc	Increase Decrease In Fair Value Of Derivatives Applied To Aocl And Noncontrolling Interests IncreaseDecreaseInFairValueOfDerivativesAppliedToAoclAndNoncontrollingInterests	-2613000	USD
	ofc	Increase Decrease In Fair Value Of Derivatives Applied To Aocl And Noncontrolling Interests IncreaseDecreaseInFairValueOfDerivativesAppliedToAoclAndNoncontrollingInterests	-4263000	USD
	ofc	Increase Decrease In Marketable Securities And Restricted Cash IncreaseDecreaseInMarketableSecuritiesAndRestrictedCash	2591000	USD
	ofc	Increase Decrease In Marketable Securities And Restricted Cash IncreaseDecreaseInMarketableSecuritiesAndRestrictedCash	1102000	USD
	ofc	Increase Decreasein Prepaid Expensesand Other Assets Usedin Investing Activities IncreaseDecreaseinPrepaidExpensesandOtherAssetsUsedinInvestingActivities	1260000	USD
	ofc	Increase Decreasein Prepaid Expensesand Other Assets Usedin Investing Activities IncreaseDecreaseinPrepaidExpensesandOtherAssetsUsedinInvestingActivities	4348000	USD
	ofc	Incremental Common Shares Attributable To Conversion Of Common Units IncrementalCommonSharesAttributableToConversionOfCommonUnits	0	shares
CY2015Q3	ofc	Incremental Common Shares Attributable To Conversion Of Common Units IncrementalCommonSharesAttributableToConversionOfCommonUnits	0	shares
	ofc	Incremental Common Shares Attributable To Conversion Of Common Units IncrementalCommonSharesAttributableToConversionOfCommonUnits	3697000	shares
	ofc	Interest And Other Income Received InterestAndOtherIncomeReceived	448000	USD
	ofc	Interest And Other Income Received InterestAndOtherIncomeReceived	4130000	USD
CY2015Q3	ofc	Maximum Additional Costs Incurred Related To Construction And Environmental Regulatory Activities MaximumAdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivities	1500000.0	USD
	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	1606000	USD
	ofc	Minority Interest Decrease From Distributions Including Joint Ventures MinorityInterestDecreaseFromDistributionsIncludingJointVentures	47000	USD
	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	3710000	USD
	ofc	Minority Interest Decrease From Distributions To Operating Partnership Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOperatingPartnershipNoncontrollingInterestHolders	3530000	USD
CY2014Q3	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	895000	USD
	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	2481000	USD
CY2015Q3	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	972000	USD
	ofc	Minority Interest In Net Income Loss Other Including Joint Ventures Minority Interests MinorityInterestInNetIncomeLossOtherIncludingJointVenturesMinorityInterests	2599000	USD
	ofc	Minority Interest Increase From Contributions Including Joint Ventures MinorityInterestIncreaseFromContributionsIncludingJointVentures	3000	USD
CY2014Q3	ofc	Net Income Loss Attributableto Common Stockholders Basic NetIncomeLossAttributabletoCommonStockholdersBasic	19064000	USD
	ofc	Net Income Loss Attributableto Common Stockholders Basic NetIncomeLossAttributabletoCommonStockholdersBasic	20863000	USD
CY2015Q3	ofc	Net Income Loss Attributableto Common Stockholders Basic NetIncomeLossAttributabletoCommonStockholdersBasic	85879000	USD
	ofc	Net Income Loss Attributableto Common Stockholders Basic NetIncomeLossAttributabletoCommonStockholdersBasic	107804000	USD
CY2014Q3	ofc	Net Income Loss From Continuing Operations Available To Common Stockholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic	18881000	USD
	ofc	Net Income Loss From Continuing Operations Available To Common Stockholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic	20854000	USD
CY2015Q3	ofc	Net Income Loss From Continuing Operations Available To Common Stockholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic	85879000	USD
	ofc	Net Income Loss From Continuing Operations Available To Common Stockholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic	107651000	USD
CY2014Q3	ofc	Net Income Lossfrom Continuing Operations Availableto Common Stockholders Diluted NetIncomeLossfromContinuingOperationsAvailabletoCommonStockholdersDiluted	18881000	USD
	ofc	Net Income Lossfrom Continuing Operations Availableto Common Stockholders Diluted NetIncomeLossfromContinuingOperationsAvailabletoCommonStockholdersDiluted	20854000	USD
	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	659000	USD
CY2015Q3	ofc	Net Income Lossfrom Continuing Operations Availableto Common Stockholders Diluted NetIncomeLossfromContinuingOperationsAvailabletoCommonStockholdersDiluted	86251000	USD
	ofc	Net Income Lossfrom Continuing Operations Availableto Common Stockholders Diluted NetIncomeLossfromContinuingOperationsAvailabletoCommonStockholdersDiluted	111876000	USD
CY2014Q3	ofc	Net Operating Income Loss From Service Operations NetOperatingIncomeLossFromServiceOperations	1146000	USD
	ofc	Net Operating Income Loss From Service Operations NetOperatingIncomeLossFromServiceOperations	5037000	USD
CY2015Q3	ofc	Net Operating Income Loss From Service Operations NetOperatingIncomeLossFromServiceOperations	926000	USD
	ofc	Net Operating Income Loss From Service Operations NetOperatingIncomeLossFromServiceOperations	2631000	USD
CY2015Q3	ofc	Number Of Primary Office Property Segments NumberOfPrimaryOfficePropertySegments	10	segment
CY2014Q4	ofc	Other Minority Interests Including Joint Ventures OtherMinorityInterestsIncludingJointVentures	9127000	USD
CY2015Q3	ofc	Other Minority Interests Including Joint Ventures OtherMinorityInterestsIncludingJointVentures	10166000	USD
	ofc	Property Operating Expenses Paid PropertyOperatingExpensesPaid	141489000	USD
	ofc	Property Operating Expenses Paid PropertyOperatingExpensesPaid	146274000	USD
CY2015Q3	ofc	Property Subject To Environmental Indemnity Lease Agreement Number Of Properties PropertySubjectToEnvironmentalIndemnityLeaseAgreementNumberOfProperties	3	Property
	ofc	Redeemable Noncontrolling Interest Equity Net Income Loss Attributableto Noncontrolling Interest RedeemableNoncontrollingInterestEquityNetIncomeLossAttributabletoNoncontrollingInterest	1647000	USD
	ofc	Redeemable Noncontrolling Interest Equity Net Income Loss Attributableto Noncontrolling Interest RedeemableNoncontrollingInterestEquityNetIncomeLossAttributabletoNoncontrollingInterest	1690000	USD
CY2014Q4	ofc	Restricted Cash And Marketable Securities RestrictedCashAndMarketableSecurities	9069000	USD
CY2015Q3	ofc	Restricted Cash And Marketable Securities RestrictedCashAndMarketableSecurities	9286000	USD
	ofc	Revenues From Real Estate Operations Received RevenuesFromRealEstateOperationsReceived	358212000	USD
	ofc	Revenues From Real Estate Operations Received RevenuesFromRealEstateOperationsReceived	373607000	USD
	ofc	Scheduled Principal Amortization Repayments Of Long Term Debt ScheduledPrincipalAmortizationRepaymentsOfLongTermDebt	4914000	USD
	ofc	Scheduled Principal Amortization Repayments Of Long Term Debt ScheduledPrincipalAmortizationRepaymentsOfLongTermDebt	5011000	USD
CY2014Q3	ofc	Segment Reporting Direct Costs Of Leased And Rented Property Or Equipment SegmentReportingDirectCostsOfLeasedAndRentedPropertyOrEquipment	42881000	USD
	ofc	Segment Reporting Direct Costs Of Leased And Rented Property Or Equipment SegmentReportingDirectCostsOfLeasedAndRentedPropertyOrEquipment	136489000	USD
CY2015Q3	ofc	Segment Reporting Direct Costs Of Leased And Rented Property Or Equipment SegmentReportingDirectCostsOfLeasedAndRentedPropertyOrEquipment	48897000	USD
	ofc	Segment Reporting Direct Costs Of Leased And Rented Property Or Equipment SegmentReportingDirectCostsOfLeasedAndRentedPropertyOrEquipment	145990000	USD
CY2015Q3	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	88836000	USD
CY2014Q3	ofc	Segment Reporting Operating Income SegmentReportingOperatingIncome	75359000	USD
	ofc	Segment Reporting Operating Income SegmentReportingOperatingIncome	222611000	USD
CY2015Q3	ofc	Segment Reporting Operating Income SegmentReportingOperatingIncome	84789000	USD
	ofc	Segment Reporting Operating Income SegmentReportingOperatingIncome	238601000	USD
	ofc	Stock Issued During Period Value New Issuesfor Other Program StockIssuedDuringPeriodValueNewIssuesforOtherProgram	26535000	USD
CY2014Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	123035000	USD
CY2015Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	98551000	USD
CY2014Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	26901000	USD
CY2015Q3	us-gaap	Accounts Receivable Net AccountsReceivableNet	19962000	USD
CY2014Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	717264000	USD
CY2015Q3	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	686986000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1297000	USD
CY2015Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5823000	USD
	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P10Y
CY2014Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1969968000	USD
CY2015Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	2002730000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5249000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5600000	USD
	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	7000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	717000	USD
CY2015Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2010000	USD
	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	805000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3646000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3339000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10800000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11900000	USD
CY2014Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	66000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1368000	USD
CY2015Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	2307000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3545000	USD
CY2014Q3	us-gaap	Assets Assets	3680188000	USD
CY2014Q4	us-gaap	Assets Assets	3670257000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3960000	USD
CY2015Q3	us-gaap	Assets Assets	3918473000	USD
CY2014Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	14339000	USD
CY2015Q3	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	150572000	USD
CY2014Q3	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.22
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.22
CY2015Q3	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.94
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	1.20
CY2014Q3	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.22
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.22
CY2015Q3	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.94
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	1.20
CY2014Q3	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	19683000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	19266000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	112941000	USD
	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	7322000	USD
	us-gaap	Cost Of Services CostOfServices	75353000	USD
CY2014Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	162085000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	467224000	USD
CY2015Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	152736000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	498657000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	54373000	USD
CY2014Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	40018000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6077000	USD
CY2015Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3840000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-14355000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-2237000	USD
CY2014Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2014Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.2750
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.825
CY2015Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.2750
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.825
CY2014Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2015Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	125000000	shares
CY2015Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	125000000	shares
CY2014Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	93255284	shares
CY2015Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	94533670	shares
CY2013Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	87394512	shares
CY2014Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	87711731	shares
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	93255284	shares
CY2015Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	94533670	shares
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	933000	USD
CY2015Q3	us-gaap	Common Stock Value CommonStockValue	945000	USD
CY2014Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24351000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	32741000	USD
CY2015Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	87118000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	114410000	USD
CY2014Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1968000	USD
CY2015Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	4453000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7324000	USD
CY2014Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	26319000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	36701000	USD
CY2015Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	91571000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	121734000	USD
CY2014Q3	us-gaap	Contracts Revenue ContractsRevenue	34739000	USD
	us-gaap	Contracts Revenue ContractsRevenue	80390000	USD
CY2015Q3	us-gaap	Contracts Revenue ContractsRevenue	17058000	USD
	us-gaap	Contracts Revenue ContractsRevenue	97554000	USD
CY2014Q3	us-gaap	Cost Of Services CostOfServices	33593000	USD
CY2014Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	30237000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	104728000	USD
CY2015Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	38403000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	103788000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	106619000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	105397000	USD
CY2014Q4	us-gaap	Development In Process DevelopmentInProcess	545426000	USD
CY2015Q3	us-gaap	Development In Process DevelopmentInProcess	414757000	USD
CY2014Q3	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	0	USD
	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	0	USD
CY2015Q3	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	372000	USD
	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	0	USD
CY2014Q3	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	43056000	USD
	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	136600000	USD
CY2015Q3	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	48897000	USD
	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	145996000	USD
CY2014Q3	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	36000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	12000	USD
CY2015Q3	us-gaap	Cost Of Services CostOfServices	16132000	USD
	us-gaap	Cost Of Services CostOfServices	94923000	USD
CY2014Q3	us-gaap	Costs And Expenses CostsAndExpenses	115593000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	345038000	USD
CY2015Q3	us-gaap	Costs And Expenses CostsAndExpenses	118751000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	382102000	USD
CY2014Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs CostsInExcessOfBillingsOnUncompletedContractsOrPrograms	6656000	USD
CY2015Q3	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs CostsInExcessOfBillingsOnUncompletedContractsOrPrograms	4722000	USD
CY2014Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	64797000	USD
CY2015Q3	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	64367000	USD
CY2014Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	95910000	USD
CY2015Q3	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	103064000	USD
CY2014Q4	us-gaap	Deferred Revenue Leases Net DeferredRevenueLeasesNet	13031000	USD
CY2015Q3	us-gaap	Deferred Revenue Leases Net DeferredRevenueLeasesNet	20113000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	4002000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	4015000	USD
CY2015Q3	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	0	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-4000	USD
	us-gaap	Dividends Dividends	84692000	USD
	us-gaap	Dividends Dividends	88658000	USD
CY2014Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	28344000	USD
CY2014Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	29862000	USD
CY2015Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	30182000	USD
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.24
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.91
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
	us-gaap	Gain Loss On Sale Of Properties Net Of Applicable Income Taxes GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	10630000	USD
CY2015Q3	us-gaap	Gain Loss On Sale Of Properties Net Of Applicable Income Taxes GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	15000	USD
	us-gaap	Gain Loss On Sale Of Properties Net Of Applicable Income Taxes GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	4000000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	118783000	USD
CY2014Q3	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	1820000	USD
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.91
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.15
CY2014Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-176000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-446000	USD
CY2015Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	85745000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	85677000	USD
	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	3923000	USD
CY2015Q3	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	4494000	USD
CY2014Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2368000	USD
CY2015Q3	us-gaap	Equity Method Investments EquityMethodInvestments	1626000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	144613000	USD
CY2015Q3	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	2200000	USD
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	1371000	USD
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	3779000	USD
CY2014Q4	us-gaap	Incentive To Lessee IncentiveToLessee	13344000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	125632000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	19700000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	5100000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	7300000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	9300000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	12300000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	17100000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	188467000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	231806000	USD
	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	10654000	USD
	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	4000000	USD
CY2014Q3	us-gaap	Gain Loss On Sale Of Properties Net Of Applicable Income Taxes GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	10630000	USD
CY2015Q3	us-gaap	Incentive To Lessee IncentiveToLessee	11589000	USD
CY2014Q3	us-gaap	Income Loss Before Gain Or Loss On Sale Of Properties Extraordinary Items And Cumulative Effects Of Accounting Changes IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges	13918000	USD
	us-gaap	Income Loss Before Gain Or Loss On Sale Of Properties Extraordinary Items And Cumulative Effects Of Accounting Changes IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges	28639000	USD
CY2015Q3	us-gaap	Income Loss Before Gain Or Loss On Sale Of Properties Extraordinary Items And Cumulative Effects Of Accounting Changes IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges	94279000	USD
	us-gaap	Income Loss Before Gain Or Loss On Sale Of Properties Extraordinary Items And Cumulative Effects Of Accounting Changes IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges	122261000	USD
CY2014Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	22537000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	35342000	USD
CY2015Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	89800000	USD
CY2014Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	13635000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	28686000	USD
CY2015Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	94309000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	122206000	USD
CY2014Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	13727000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	28635000	USD
CY2015Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	94279000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	122105000	USD
CY2014Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.22
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.24
CY2015Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.91
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.15
CY2014Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.22
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.24
CY2015Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.91
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.15
CY2014Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	191000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	4000	USD
CY2015Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	156000	USD
CY2014Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	8000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	-5000	USD
CY2015Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	3000	USD
CY2014Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	183000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	9000	USD
CY2015Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	153000	USD
CY2014Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2015Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2014Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2015Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2014Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	193000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	206000	USD
CY2015Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	18000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	52000	USD
CY2014Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	101000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	257000	USD
CY2015Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	48000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	153000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-200000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	8000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6815000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6526000	USD
	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	24247000	USD
	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	-655000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	26553000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	5228000	USD
CY2014Q3	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
CY2015Q3	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	434000	shares
	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2014Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	195000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	169000	shares
CY2015Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	21000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	82000	shares
CY2014Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	43854000	USD
CY2015Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	106174000	USD
CY2014Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	24802000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	69107000	USD
CY2015Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	24121000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	66727000	USD
CY2014Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1300000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	4300000	USD
CY2015Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1500000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	5600000	USD
	us-gaap	Interest Paid Net InterestPaidNet	54683000	USD
	us-gaap	Interest Paid Net InterestPaidNet	46278000	USD
CY2014Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	1855000	USD
CY2015Q3	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	5844000	USD
CY2014Q4	us-gaap	Liabilities Liabilities	2130956000	USD
CY2015Q3	us-gaap	Liabilities Liabilities	2318958000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3670257000	USD
CY2015Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3918473000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Other LoansAndLeasesReceivableNetReportedAmountOther	3797000	USD
CY2015Q3	us-gaap	Loans And Leases Receivable Net Reported Amount Other LoansAndLeasesReceivableNetReportedAmountOther	3744000	USD
CY2014Q4	us-gaap	Long Term Debt LongTermDebt	1920057000	USD
CY2015Q3	us-gaap	Long Term Debt LongTermDebt	2121240000	USD
CY2014Q4	us-gaap	Minority Interest MinorityInterest	69461000	USD
CY2015Q3	us-gaap	Minority Interest MinorityInterest	69958000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	7000	USD
	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	599000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	976000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1098000	USD
CY2014Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	51534000	USD
CY2015Q3	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	50992000	USD
CY2014Q4	us-gaap	Minority Interest In Preferred Unit Holders MinorityInterestInPreferredUnitHolders	8800000	USD
CY2015Q3	us-gaap	Minority Interest In Preferred Unit Holders MinorityInterestInPreferredUnitHolders	8800000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-21557000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	221310000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-137046000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-371289000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	144248000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	147742000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	22720000	USD
	us-gaap	Net Income Loss NetIncomeLoss	35351000	USD
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	89800000	USD
	us-gaap	Net Income Loss NetIncomeLoss	118936000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	694000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2330000	USD
CY2014Q4	us-gaap	Notes Receivable Net NotesReceivableNet	52147000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	86999000	USD
CY2014Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	19167000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	21195000	USD
CY2015Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	86248000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	108279000	USD
CY2014Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	19064000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	20863000	USD
CY2015Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	86251000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	112035000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	55490000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed1 NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1	0	USD
	us-gaap	Noncash Or Part Noncash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed1 NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1	5265000	USD
CY2014Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	768000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	942000	USD
CY2015Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	3357000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable	4231000	USD
CY2014Q3	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	495000	USD
CY2015Q3	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	495000	USD
	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
CY2015Q3	us-gaap	Notes Receivable Net NotesReceivableNet	46821000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	37422000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	94464000	USD
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	31993000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	100039000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	91643000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	1036000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	1052000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	1096000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	1171000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Remainder Of Fiscal Year OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear	289000	USD
CY2014Q3	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	96207000	USD
	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	288574000	USD
CY2015Q3	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	109080000	USD
	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	312826000	USD
CY2014Q4	us-gaap	Other Assets OtherAssets	2875000	USD
CY2015Q3	us-gaap	Other Assets OtherAssets	6495000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
CY2015Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-264000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1771000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1389000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2568000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2723000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4527000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1015000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-4738000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-3638000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-6720000	USD
CY2014Q4	us-gaap	Other Liabilities OtherLiabilities	12105000	USD
CY2015Q3	us-gaap	Other Liabilities OtherLiabilities	8524000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	2446000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1922000	USD
CY2014Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1191000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	3775000	USD
CY2015Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	692000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	3217000	USD
CY2014Q3	us-gaap	Other Preferred Stock Dividends And Adjustments OtherPreferredStockDividendsAndAdjustments	0	USD
	us-gaap	Other Preferred Stock Dividends And Adjustments OtherPreferredStockDividendsAndAdjustments	1769000	USD
CY2015Q3	us-gaap	Other Preferred Stock Dividends And Adjustments OtherPreferredStockDividendsAndAdjustments	0	USD
	us-gaap	Other Preferred Stock Dividends And Adjustments OtherPreferredStockDividendsAndAdjustments	0	USD
CY2014Q3	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	22069000	USD
	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	70538000	USD
CY2015Q3	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	24606000	USD
	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	71761000	USD
CY2014Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	103000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	332000	USD
CY2015Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	369000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	475000	USD
	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	21179000	USD
	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	12610000	USD
	us-gaap	Payments For Leasing Costs PaymentsForLeasingCosts	10549000	USD
	us-gaap	Payments For Leasing Costs PaymentsForLeasingCosts	8603000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	83000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	457000	USD
	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	50000000	USD
	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	0	USD
	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	17754000	USD
	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	18129000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	104000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	18000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	72217000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	77641000	USD
	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	3786000	USD
	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	3581000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	13179000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	10657000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	5377000	USD
	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	0	USD
	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	202866000	USD
	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	3610000	USD
	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	22000	USD
	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	150862000	USD
	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	174434000	USD
CY2014Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3553000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	12387000	USD
CY2015Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3552000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	10657000	USD
CY2014Q4	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	199083000	USD
CY2015Q3	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	199083000	USD
CY2014Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2015Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2014Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2015Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2014Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	7431667	shares
CY2015Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	7431667	shares
CY2014Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	7431667	shares
CY2015Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	7431667	shares
CY2014Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	60249000	USD
CY2015Q3	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	66787000	USD
CY2014Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	20570000	USD
CY2015Q3	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	28655000	USD
	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	10278000	USD
	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	5114000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1352000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	28567000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	11569000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	50000000	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	297342000	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	296580000	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	115000000	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	422000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2582000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2559000	USD
	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	57973000	USD
	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	45066000	USD
CY2014Q3	us-gaap	Profit Loss ProfitLoss	24548000	USD
	us-gaap	Profit Loss ProfitLoss	39269000	USD
CY2015Q3	us-gaap	Profit Loss ProfitLoss	94294000	USD
	us-gaap	Profit Loss ProfitLoss	126261000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6637000	USD
CY2015Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5941000	USD
CY2014Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	3296914000	USD
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	57888	shares
CY2014Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	7211000	USD
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	76474	shares
	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	359100000	USD
CY2015Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	133686000	USD
	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	384591000	USD
CY2014Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	18417000	USD
CY2015Q3	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	19608000	USD
CY2013Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	17758000	USD
CY2014Q3	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	18436000	USD
CY2014Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	18417000	USD
CY2015Q3	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	19608000	USD
CY2014Q4	us-gaap	Rental Properties RentalProperties	2751488000	USD
CY2015Q3	us-gaap	Rental Properties RentalProperties	2932843000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	115000000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	418000000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	183059000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	50681000	USD
CY2014Q3	us-gaap	Revenues Revenues	153015000	USD
	us-gaap	Revenues Revenues	439502000	USD
CY2015Q3	us-gaap	Revenues Revenues	150744000	USD
	us-gaap	Revenues Revenues	482141000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	22882000	USD
CY2015Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	7439000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	22864000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4563000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4949000	USD
	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	117149	shares
	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	160160	shares
	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	142182	shares
	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	151511	shares
	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1359000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2008000	USD
	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	50000000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1389000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	2330000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	1451423000	USD
CY2015Q3	us-gaap	Stockholders Equity StockholdersEquity	1509949000	USD
CY2013Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1497249000	USD
CY2014Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1397504000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1520884000	USD
CY2015Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1579907000	USD
	us-gaap	Straight Line Rent StraightLineRent	2738000	USD
	us-gaap	Straight Line Rent StraightLineRent	11939000	USD
CY2014Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	87485000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	87365000	shares
CY2015Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	94608000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	97609000	shares
CY2014Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	87290000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	87196000	shares
CY2015Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	94153000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	93830000	shares
	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Organization</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font 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 focus primarily on serving the specialized requirements of United States Government agencies and their contractors, most of whom are engaged in national security and information technology related activities. We generally acquire, develop, manage and lease office and data center properties concentrated in large office parks located near knowledge-based government demand drivers and/or in targeted markets or submarkets in the Greater Washington, DC/Baltimore region. As of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">September 30, 2015</font><font style="font-family:inherit;font-size:10pt;">, our properties included the following:</font></div><div style="line-height:120%;padding-left:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">183</font><font style="font-family:inherit;font-size:10pt;"> operating office properties totaling </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">18.8 million</font><font style="font-family:inherit;font-size:10pt;"> square feet;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">10</font><font style="font-family:inherit;font-size:10pt;"> office properties under, or contractually committed for, construction or redevelopment that we estimate will total approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">1.2 million</font><font style="font-family:inherit;font-size:10pt;"> square feet upon completion, including </font><font style="font-family:inherit;font-size:10pt;">one</font><font style="font-family:inherit;font-size:10pt;"> partially operational property included above;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">1,450</font><font style="font-family:inherit;font-size:10pt;"> acres of land we control that we believe are potentially developable into approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">17.7 million</font><font style="font-family:inherit;font-size:10pt;"> square feet; and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">a wholesale data center with a critical load of </font><font style="font-family:inherit;font-size:10pt;">19.25</font><font style="font-family:inherit;font-size:10pt;"> megawatts.</font></div></td></tr></table><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">COPLP owns real estate both 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 and construction and development services primarily for our properties but also for third parties. Some of these services are performed by a taxable REIT subsidiary (“TRS”).</font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Equity interests in COPLP are in the form of common and preferred units. As of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">September 30, 2015</font><font style="font-family:inherit;font-size:10pt;">, COPT owned </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">96.3%</font><font style="font-family:inherit;font-size:10pt;"> of the outstanding COPLP common units (“common units”) and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">95.5%</font><font style="font-family:inherit;font-size:10pt;"> of the outstanding COPLP preferred units (“preferred units”); the remaining common and preferred units in COPLP were owned by third parties. Common units in COPLP not owned by COPT carry certain redemption rights. The number of common units in COPLP owned by COPT is equivalent to the number of outstanding common shares of beneficial interest (“common shares”) of COPT, and the entitlement of all COPLP common units to quarterly distributions and payments in liquidation is substantially the same as those of COPT common shareholders. Similarly, in the case of each series of preferred units in COPLP held by COPT, there is 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. COPT’s common shares are publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “OFC”. </font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font 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, and although, as a partnership, COPLP does not have a board of trustees, we refer to COPT’s Board of Trustees as COPLP’s Board of Trustees.</font></div></div>

Files In Submission

Name	View Source	Status
0000860546-15-000047-index-headers.html	Edgar Link	pending
0000860546-15-000047-index.html	Edgar Link	pending
0000860546-15-000047.txt	Edgar Link	pending
0000860546-15-000047-xbrl.zip	Edgar Link	pending
copt09302015ex121.htm	Edgar Link	pending
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copt10q09302015document.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
ofc-20150930.xml	Edgar Link	completed
ofc-20150930.xsd	Edgar Link	pending
ofc-20150930_cal.xml	Edgar Link	unprocessable
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2015 Q4 Form 10-Q Financial Statement

#000086054615000047 Filed on November 04, 2015

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$CDP COPT Defense Properties Stock $cdp

2015 Q4 Form 10-Q Financial Statement

#000086054615000047 Filed on November 04, 2015

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CDP
COPT Defense Properties Stock $cdp