Joint Venture Acquired Ownership Percentage

No definition available.

Name:	cdr_JointVentureAcquiredOwnershipPercentage
Namespace Prefix:	cdr_
Data Type:	num:percentItemType
Balance Type:	na
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

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Name:	us-gaap_PaymentsToAcquireRealEstate
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
Namespace Prefix:	us-gaap_
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:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cdr_NewLondonJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- 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:
Period Type:

- Details

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

- Details

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

Real Estate (Narrative) (Details) - USD ($)					6 Months Ended
Real Estate (Narrative) (Details) - USD ($)	Jul. 23, 2015	May. 28, 2015	Feb. 27, 2015	Jan. 23, 2015	Jun. 30, 2015	Jun. 30, 2014
Real Estate Properties [Line Items]
Purchase price of acquired property					$ 24,453,000	$ 38,861,000
Acquisition costs					$ 499,000	$ 2,870,000
New London Joint Venture [Member]
Real Estate Properties [Line Items]
Acquired ownership percentage in joint venture				60.00%
New London Mall [Member]
Real Estate Properties [Line Items]
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
Kenley Village [Member]
Real Estate Properties [Line Items]
Sales price of real estate sold		$ 2,300,000
Circle Plaza [Member]
Real Estate Properties [Line Items]
Sales price of real estate sold	$ 1,800,000