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Mortgage Loans Payable And Unsecured Credit Facilities (Narrative) (Details) (USD $)	12 Months Ended	0 Months Ended		12 Months Ended
	Dec. 31, 2014	Feb. 05, 2015	Feb. 11, 2014	Dec. 31, 2013	Dec. 31, 2012	May 29, 2014	Aug. 13, 2013
Line of Credit Facility [Line Items]
Mortgage loan payable collateralized by sale of property	$ 393,388,000us-gaap_SecuredDebt			$ 516,292,000us-gaap_SecuredDebt	$ 589,168,000us-gaap_SecuredDebt
Liability recorded for sale of property	711,528,000us-gaap_Liabilities			796,278,000us-gaap_Liabilities
Fair value of interest rate swaps included in accounts payable and accrued liabilities	2,777,000us-gaap_DerivativeLiabilities			647,000us-gaap_DerivativeLiabilities
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings	2,700,000cdr_ApproximateAmountOfAccumulatedOtherComprehensiveLossToBeReclassifiedIntoEarnings
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Term loan amount		50,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Townfair Center [Member]
Line of Credit Facility [Line Items]
Liability recorded for sale of property						700,000us-gaap_Liabilities / us-gaap_RealEstatePropertiesAxis = cdr_TownfairCenterMember
Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Fair value of interest rate swaps included in accounts payable and accrued liabilities	2,777,000us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Interest Rate Swap [Member] | Townfair Center [Member]
Line of Credit Facility [Line Items]
Mortgage loan payable collateralized by sale of property						11,800,000us-gaap_SecuredDebt / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_RealEstatePropertiesAxis = cdr_TownfairCenterMember
Unsecured Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility borrowing capacity							310,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_UnsecuredDebtMember
Term loan amount			150,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = us-gaap_UnsecuredDebtMember
Unsecured Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Term loan amount		100,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = us-gaap_UnsecuredDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility expiration date	Feb. 05, 2019
Extension period	1 year
Aggregate borrowing capacity including increase under accordion feature	750,000,000cdr_AggregateBorrowingCapacityIncludingAdditionalBorrowingIncreaseUnderAccordionFeature / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Remaining borrowing capacity	187,700,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility borrowing capacity		260,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Basis spread on borrowings variable rate		150.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	135.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	195.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Term Loan [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate		145.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term Loan [Member] | Unsecured Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility expiration date	Feb. 05, 2020
Term Loan [Member] | Unsecured Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Term loan amount		50,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = us-gaap_UnsecuredDebtMember / us-gaap_DebtInstrumentAxis = cdr_TermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term Loan [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	130.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Term Loan [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	190.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Term Loan Maturing February 11, 2019 [Member]
Line of Credit Facility [Line Items]
Term loan amount			75,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandNineteenMember
Debt term			5 years
Loan maturity date	Feb. 11, 2019
Term Loan Maturing February 11, 2019 [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate		145.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandNineteenMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Weighted-average interest rate		3.10%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandNineteenMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term Loan Maturing February 11, 2019 [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	130.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandNineteenMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Term Loan Maturing February 11, 2019 [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	190.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandNineteenMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Term Loan Maturing February 11, 2021 [Member]
Line of Credit Facility [Line Items]
Term loan amount			75,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandTwentyOneMember
Debt term			7 years
Loan maturity date	Feb. 11, 2021
Term Loan Maturing February 11, 2021 [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate		180.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandTwentyOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Weighted-average interest rate		4.10%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandTwentyOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term Loan Maturing February 11, 2021 [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	170.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandTwentyOneMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Term Loan Maturing February 11, 2021 [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	230.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryElevenTwoThousandTwentyOneMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Term Loan Maturing February 5, 2020 [Member]
Line of Credit Facility [Line Items]
Debt term	5 years
Loan maturity date	Feb. 05, 2020
Weighted-average interest rate		2.90%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyMember
Term Loan Maturing February 5, 2020 [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Term loan amount		50,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Basis spread on borrowings variable rate		145.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term Loan Maturing February 5, 2020 [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	130.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Term Loan Maturing February 5, 2020 [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	190.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Term Loan Maturing February 5, 2022 [Member]
Line of Credit Facility [Line Items]
Debt term	7 years
Loan maturity date	Feb. 05, 2022
Weighted-average interest rate		3.40%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyTwoMember
Term Loan Maturing February 5, 2022 [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Term loan amount		50,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Basis spread on borrowings variable rate		170.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term Loan Maturing February 5, 2022 [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	155.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyTwoMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Term Loan Maturing February 5, 2022 [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on borrowings variable rate	215.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cdr_TermLoanMaturingFebruaryFifthTwoThousandTwentyTwoMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Continuing Operations [Member]
Line of Credit Facility [Line Items]
Payments of early extinguishment of debt costs	825,000us-gaap_PaymentsOfDebtExtinguishmentCosts / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember			106,000us-gaap_PaymentsOfDebtExtinguishmentCosts / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Discontinued Operations [Member]
Line of Credit Facility [Line Items]
Payments of early extinguishment of debt costs				437,000us-gaap_PaymentsOfDebtExtinguishmentCosts / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Mortgage loan payable collateralized by sale of property	$ 0us-gaap_SecuredDebt / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

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Aggregate Borrowing Capacity Including Additional Borrowing Increase Under Accordion Feature

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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