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Real Estate (Schedule of Transactions Related to Properties Held for Sale/Conveyance) (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations [Member] - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Real Estate Properties [Line Items] |  |  |
Sales Price | $ 19,378,000 | $ 19,600,000 | $ 12,850,000
Gain on Sale | $ 2,942,000 | $ 4,864,000 | $ 7,099,000
Maxatawny Marketplace [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location | Maxatawny, PA |  |
Date Sold | Feb. 15, 2019 |  |
Sales Price | $ 10,330,000 |  |
Gain on Sale | $ 101,000 |  |
Mechanicsburg Center [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location |  | Mechanicsburg, PA |
Date Sold |  | Aug. 28, 2018 |
Sales Price |  | $ 16,100,000 |
Gain on Sale |  | $ 4,864,000 |
West Bridgewater Plaza [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location |  | West Bridgewater, MA |
Date Sold |  | Sep. 28, 2018 |
Sales Price |  | $ 3,500,000 |
Outparcel Building Adjacent to Camp Hill [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location |  |  | Camp Hill, PA
Date Sold |  |  | Feb. 01, 2017
Sales Price |  |  | $ 10,650,000
Gain on Sale |  |  | $ 7,099,000
Fort Washington Center [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location | Fort Washington, PA |  |
Date Sold | Jun. 26, 2019 |  |
Sales Price | $ 9,048,000 |  |
Gain on Sale | $ 2,841,000 |  |
Fredericksburg Way [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location |  |  | Fredericksburg, VA
Date Sold |  |  | Dec. 29, 2017
Sales Price |  |  | $ 2,200,000

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- Definition Property held for sale date sold. + References No definition available. + Details
Name: | cdr_PropertyHeldForSaleDateSold
Namespace Prefix: | cdr_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Real estate dispositions sales price. + References No definition available. + Details
Name: | cdr_RealEstateDispositionsSalesPrice
Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Real estate sold properties location. + References No definition available. + Details
Name: | cdr_RealEstateSoldPropertiesLocation
Namespace Prefix: | cdr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
Name: | us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=cdr_MaxatawnyMarketplaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=cdr_MechanicsburgCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=cdr_WestBridgewaterPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=cdr_OutparcelBuildingAdjacentToCampHillMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=cdr_FortWashingtonCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=cdr_FredericksburgWayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |