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Mortgage Loans Payable and Credit Facility (Schedule of Mortgage Loans Payable Repaid) (Details) - Mortgage Loans Payable [Member] | 9 Months Ended
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Sep. 30, 2018 USD ($)
East River Park [Member] |
Debt Instrument [Line Items] |
Repayment date | Aug. 10, 2018
Principal payoff amount | $ 18,772,000
Colonial Commons [Member] |
Debt Instrument [Line Items] |
Repayment date | Aug. 24, 2018
Principal payoff amount | $ 24,108,000
Shoppes At Arts District [Member] |
Debt Instrument [Line Items] |
Repayment date | Aug. 24, 2018
Principal payoff amount | $ 8,114,000
The Point [Member] |
Debt Instrument [Line Items] |
Repayment date | Sep. 06, 2018
Principal payoff amount | $ 27,003,000

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- Definition Mortgage repayment date. + References No definition available. + Details
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Namespace Prefix: | cdr_
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Balance Type: | na
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 The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |