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Real Estate (Schedule Of Transactions Related To Properties Held For Sale/Conveyance) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Real Estate Properties [Line Items] |  |  |
Sales Price | $ 4,075,000 | $ 52,975,000 |
Gain on Sales |  | $ 6,413,000 | $ 609,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Sales Price |  |  | 3,541,000
Gain on Sales |  |  | $ 481,000
Kenley Village [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold | May 28, 2015 |  |
Sales Price | $ 2,275,000 |  |
Circle Plaza [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold | Jul. 22, 2015 |  |
Sales Price | $ 1,800,000 |  |
Fairview Plaza [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold |  | May 27, 2014 |
Sales Price |  | $ 12,450,000 |
Gain on Sales |  | $ 3,810,000 |
Carbondale Plaza [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold |  | Jul. 18, 2014 |
Sales Price |  | $ 10,700,000 |
Gain on Sales |  | $ 123,000 |
Virginia Little Creek [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold |  | Aug. 22, 2014 |
Sales Price |  | $ 9,850,000 |
Gain on Sales |  | $ 2,209,000 |
Annie Land Plaza [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold |  | Sep. 26, 2014 |
Sales Price |  | $ 3,500,000 |
Smithfield Plaza [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold |  | Oct. 21, 2014 |
Sales Price |  | $ 12,350,000 |
St. James Square [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold |  | Nov. 05, 2014 |
Sales Price |  | $ 4,125,000 |
Gain on Sales |  | $ 271,000 |

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- Definition Property Held For Sale Date Sold + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:dateItemType
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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Paragraph a -Subparagraph 1(ii) -Article 3 + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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Period Type: | duration

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- Details
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- Details
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- Details
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- Details
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- Details
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