Impairment Reversals Of Real Estate

No definition available.

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- Definition

Joint Venture Acquired Ownership Percentage

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Payments To Acquire Real Estate Cash Paid

+ References

No definition available.

+ Details

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

- Definition

Percentage Of Share Of In-Place Mortgage Financing

+ References

No definition available.

+ Details

Name:	cdr_PercentageOfShareOfInPlaceMortgageFinancing
Namespace Prefix:	cdr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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=34752592&loc=d3e1043-128460

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

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

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

Name:	us-gaap_PaymentsToAcquireInterestInJointVenture
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	cdr_DisposalGroupClassificationAxis=cdr_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RealEstatePropertiesAxis=cdr_NewLondonMallMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=cdr_LawndalePlazaMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RealEstatePropertiesAxis=cdr_EastRiverParkMember
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- Details

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- Details

Name:	us-gaap_RealEstatePropertiesAxis=cdr_QuartermasterPlazaMember
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Data Type:	na
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Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cdr_MortgageLoanPayableMaturingOctober2015Member
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- Details

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- Details

Name:	us-gaap_RealEstatePropertiesAxis=cdr_LandParcelsMember
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- Details

Name:	us-gaap_RealEstatePropertiesAxis=cdr_LibertyMarketplaceMember
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Real Estate (Narrative) (Details) - USD ($)						12 Months Ended
Real Estate (Narrative) (Details) - USD ($)	Feb. 11, 2016	Dec. 23, 2015	Feb. 27, 2015	Jan. 23, 2015	Mar. 21, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate Properties [Line Items]
Purchase price of acquired property						$ 42,991,000	$ 38,861,000	$ 32,818,000
Acquisition costs						1,238,000	2,870,000	182,000
Sales price of real estate sold						4,075,000	52,975,000
Impairment charges/(reversal), net						212,000	(3,148,000)	172,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Sales price of real estate sold								3,541,000
Impairment charges/(reversal), net						$ (200,000)	(3,400,000)
New London Mall [Member]
Real Estate Properties [Line Items]
Acquired ownership percentage in joint venture				60.00%
Percentage of joint venture ownership				100.00%
Payments to acquire interest in joint ventures				$ 27,300,000
Amount of purchase price paid in cash				10,900,000
Amount of purchase price representing 60% share of in-place mortgage financing				$ 16,400,000
Percentage of share of in-place mortgage financing				60.00%
Lawndale Plaza [Member]
Real Estate Properties [Line Items]
Purchase price of acquired property			$ 25,200,000
Acquisition costs			$ 500,000
East River Park [Member]
Real Estate Properties [Line Items]
Purchase price of acquired property		$ 39,000,000
Acquisition costs		$ 700,000
Mortgage interest rate		3.90%
Mortgage maturity date		Sep. 01, 2022
East River Park [Member] \| Parent Company [Member]
Real Estate Properties [Line Items]
Purchase price of acquired property		$ 20,500,000
Quartermaster Plaza [Member]
Real Estate Properties [Line Items]
Mortgage amount					$ 53,400,000
Purchase price of acquired property					92,300,000
Quartermaster Plaza [Member] \| Mortgage Loan Payable Maturing October 2015 [Member]
Real Estate Properties [Line Items]
Mortgage amount					$ 42,100,000
Mortgage interest rate					5.30%
Mortgage maturity date						Oct. 01, 2015
Quartermaster Plaza [Member] \| Mortgage Loan Payable Maturing October 2014 [Member]
Real Estate Properties [Line Items]
Mortgage amount					$ 11,300,000
Mortgage interest rate					5.50%
Mortgage maturity date						Oct. 01, 2014
Land Parcels [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Impairment charges/(reversal), net							$ (300,000)	$ 900,000
Liberty Marketplace [Member] \| Subsequent Event [Member]
Real Estate Properties [Line Items]
Sales price of real estate sold	$ 15,000,000