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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 | $ 24,449,000 us-gaap_PaymentsToAcquireRealEstate | $ 38,861,000 us-gaap_PaymentsToAcquireRealEstate |  |
Acquisition costs | 499,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 2,870,000 us-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 |  |  | 27,300,000 us-gaap_PaymentsToAcquireInterestInJointVenture / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember |
Amount of purchase price paid in cash |  |  | 10,900,000 cdr_PaymentsToAcquireRealEstateCashPaid / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember |
Amount of purchase price representing 60% share of in-place mortgage financing |  |  | 16,400,000 cdr_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 |  |  |  | 25,200,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_LawndalePlazaMember
Acquisition costs |  |  |  | $ 500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_RealEstatePropertiesAxis = cdr_LawndalePlazaMember

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- Definition Joint Venture Acquired Ownership Percentage + References No definition available. + Details
Name: | cdr_JointVentureAcquiredOwnershipPercentage
Namespace Prefix: | cdr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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

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- 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

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- 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- 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
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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 + Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_RealEstatePropertiesAxis=cdr_NewLondonMallMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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