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Mortgage Loans Payable And Credit Facility (Summary Of The Derivative Financial Instruments Held) (Details) (USD $)	12 Months Ended	3 Months Ended
	Dec. 31, 2014	Mar. 31, 2015
Derivatives, Fair Value [Line Items]
Count	2us-gaap_NumberOfInterestRateDerivativesHeld	4us-gaap_NumberOfInterestRateDerivativesHeld
Notional values	150,000,000us-gaap_DerivativeLiabilityNotionalAmount	200,000,000us-gaap_DerivativeLiabilityNotionalAmount
Fair value	2,777,000us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue	4,861,000us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue
Interest Rate Swap One [Member]
Derivatives, Fair Value [Line Items]
Maturity date	2019
Interest Rate Swap Two [Member]
Derivatives, Fair Value [Line Items]
Maturity date	2021
Minimum [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Maturity date		2019
Maximum [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Maturity date		2022

X

- Definition

Derivative Maturity Year

+ References

No definition available.

+ Details

Name:	cdr_DerivativeMaturityYear
Namespace Prefix:	cdr_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

+ Details

Name:	us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

+ Details

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Period Type:	instant

X

- Details

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X

- Details

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X

- Details

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- Details

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