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Real Estate (Narrative) (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 23, 2015	Feb. 27, 2015
Real Estate Properties [Line Items]
Purchase price of acquired property	$ 24,449,000us-gaap_PaymentsToAcquireRealEstate	$ 38,861,000us-gaap_PaymentsToAcquireRealEstate
Acquisition costs	499,000us-gaap_BusinessCombinationAcquisitionRelatedCosts	2,870,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
New London Joint Venture [Member]
Real Estate Properties [Line Items]
Acquired ownership percentage in joint venture			60.00%cdr_JointVentureAcquiredOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cdr_NewLondonJointVentureMember
New London Mall [Member]
Real Estate Properties [Line Items]
Percentage of joint venture ownership			100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember
Payments to acquire interest in joint ventures			27,300,000us-gaap_PaymentsToAcquireInterestInJointVenture / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember
Amount of purchase price paid in cash			10,900,000cdr_PaymentsToAcquireRealEstateCashPaid / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember
Amount of purchase price representing 60% share of in-place mortgage financing			16,400,000cdr_PaymentsToAcquireRealEstateAmountRepresentingInPlaceMortgageFinancing / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember
Percentage Of Share Of In-Place Mortgage Financing			60.00%cdr_PercentageOfShareOfInPlaceMortgageFinancing / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember
Lawndale Plaza [Member]
Real Estate Properties [Line Items]
Purchase price of acquired property				25,200,000us-gaap_PaymentsToAcquireRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_LawndalePlazaMember
Acquisition costs				$ 500,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_RealEstatePropertiesAxis = cdr_LawndalePlazaMember

X

- Definition

Joint Venture Acquired Ownership Percentage

+ References

No definition available.

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X

- Definition

Payments To Acquire Real Estate Amount Representing In-Place Mortgage Financing

+ References

No definition available.

+ Details

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Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Payments To Acquire Real Estate Cash Paid

+ References

No definition available.

+ Details

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Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Percentage Of Share Of In-Place Mortgage Financing

+ References

No definition available.

+ Details

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Namespace Prefix:	cdr_
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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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X

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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