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Mortgage Loans Payable And Unsecured Credit Facilities (Schedule Of Debt Included In Discontinuing Operations) (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Total property-specific mortgages, Balance outstanding | $ 516,292,000 us-gaap_SecuredDebt | $ 393,388,000 us-gaap_SecuredDebt | $ 589,168,000 us-gaap_SecuredDebt
Mortgage Loans On Real Estate Held For Sale | 22,848,000 cdr_MortgageLoansOnRealEstateHeldForSale |  |
Discontinued Operations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total property-specific mortgages, Balance outstanding |  | 0 us-gaap_SecuredDebt / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |
Discontinued Operations [Member] | Fixed-Rate Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total property-specific mortgages, Balance outstanding | 22,848,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = cdr_FixedRateMortgagesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Weighted average interest rate | 5.40%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cdr_FixedRateMortgagesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Interest rate, minimum | 5.20%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = cdr_FixedRateMortgagesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Interest rate, maximum | 6.10%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = cdr_FixedRateMortgagesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Fixed annual interest rate | 5.20%us-gaap_DerivativeFixedInterestRate / us-gaap_DebtInstrumentAxis = cdr_FixedRateMortgagesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Mortgage Loans On Real Estate Held For Sale | $ 11,900,000 cdr_MortgageLoansOnRealEstateHeldForSale / us-gaap_DebtInstrumentAxis = cdr_FixedRateMortgagesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |

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- Definition Total carrying amount of mortgage loans in connection with real estate held for sale as of the balance sheet date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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