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Shareholders' Equity (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Oct. 10, 2014 | Jun. 30, 2014 | Jan. 13, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 12, 2013 | Mar. 11, 2013 | Jan. 24, 2015 | Jan. 12, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Public offering, realized net proceeds, net offering expenses |  |  | $ 41,300,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |
Public offering, shares |  |  | 6,900,000 us-gaap_CommonStockSharesIssued | 79,213,000 us-gaap_CommonStockSharesIssued | 72,200,000 us-gaap_CommonStockSharesIssued |  |  |  |
Shares issued to underwriters |  |  | 900,000 cdr_SharesIssuedToUnderwriters |  |  |  |  |  |
At-the-market program, shares authorized |  |  |  | 10,000,000 cdr_AtMarketContinuousOfferingProgramSharesAuthorized |  |  |  |  |
At-the-market program, shares sold |  |  |  | 0 cdr_AtMarketContinuousOfferingProgramSharesSold |  |  |  |  |
Stock price as percentage of market value |  |  |  | 100.00%cdr_CommonStockPurchasePriceAsPercentageOfStockMarketValueUnderDividendReinvestmentAndDirectStockPurchasePlan |  |  |  |  |
Remaining shares authorized under DRIP |  |  |  | 2,849,000 cdr_DividendReinvestmentPlanSharesAvailableForIssuance |  |  |  |  |
Redemptions of OP Units, shares | 2,000 cdr_OperatingPartnershipUnitsRedeemed | 69,000 cdr_OperatingPartnershipUnitsRedeemed |  |  | 32,000 cdr_OperatingPartnershipUnitsRedeemed |  |  |  |
OP units converted |  |  |  | 51,000 us-gaap_PartnersCapitalAccountUnitsConverted | 3,000 us-gaap_PartnersCapitalAccountUnitsConverted |  |  |  |
Number of OP units called by warrants |  |  |  | 393,000 us-gaap_UnitsOfPartnershipInterestAmount | 270,000 us-gaap_UnitsOfPartnershipInterestAmount |  |  |  |
Accrued preferred stock dividends |  |  |  | 1,600,000 cdr_PreferredStockDividendsAccrued | 1,600,000 cdr_PreferredStockDividendsAccrued |  |  |  |
Dividends payable, date declared |  |  |  | Jan. 24, 2015 |  |  |  |  |
Dividends payable, date to be paid |  |  |  | Feb. 20, 2015 |  |  |  |  |
Dividends payable, date of record |  |  |  | Feb. 10, 2015 |  |  |  |  |
Series B [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  | 7.25%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Liquidation preference, per share |  |  |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Redemption price per share |  |  |  | $ 25.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Shares issued in public offering |  |  |  |  |  | 2,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Public offering, per share |  |  |  |  |  | $ 24.58 cdr_PublicOfferingPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Public offering, realized net proceeds, net offering expenses |  |  |  |  |  | 47,600,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Additional shares issued to underwriters |  |  |  |  |  | 300,000 cdr_AdditionalSharesIssuedToUnderwriters / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Net proceeds realized from issuance of additional shares to underwriters |  |  |  |  |  | 7,100,000 cdr_NetProceedsRealizedFromIssuanceOfSharesToUnderwriters / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
ATM equity program, shares issued |  |  |  |  | 221,000 cdr_AtMarketEquityProgramSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
ATM equity program, weighted average price per share |  |  |  |  | $ 24.52 cdr_AtMarketEquityProgramWeightedAveragePricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
ATM equity program, realized net proceeds, net offering expenses |  |  |  |  | 5,200,000 cdr_AtMarketEquityProgramRealizedNetProceedsNetOfferingExpenses / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Series A [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  | 8.875%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |
Redemption price per share |  |  |  | $ 25.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |
Shares of Redeemable Preferred Stock redeemed and purchased |  |  |  |  |  |  | 1,408,000 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased |  |  |  |  |  |  | 35,400,000 cdr_PaymentsForRepurchaseOfRedeemablePreferredStockIncludingAccruedDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Limited Partners' Interest In Operating Partnership [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Cash outlay for redeemed OP units | 13,000 cdr_PaymentsForRedemptionOfOperatingPartnershipUnits / us-gaap_StatementClassOfStockAxis = us-gaap_PartnershipInterestMember | 424,000 cdr_PaymentsForRedemptionOfOperatingPartnershipUnits / us-gaap_StatementClassOfStockAxis = us-gaap_PartnershipInterestMember |  |  | 170,000 cdr_PaymentsForRedemptionOfOperatingPartnershipUnits / us-gaap_StatementClassOfStockAxis = us-gaap_PartnershipInterestMember |  |  |  |
Mezzanine OP Units [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Redemptions of OP Units, shares |  |  |  |  | 30,000 cdr_OperatingPartnershipUnitsRedeemed / us-gaap_StatementClassOfStockAxis = cdr_MezzanineOperatingPartnershipUnitsMember |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Public offering, realized net proceeds, net offering expenses |  |  |  |  |  |  |  |  | $ 41,900,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Public offering, shares |  |  |  |  |  |  |  |  | 5,750,000 us-gaap_CommonStockSharesIssued / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Shares issued to underwriters |  |  |  |  |  |  |  |  | 750,000 cdr_SharesIssuedToUnderwriters / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common stock, dividends declared |  |  |  |  |  |  |  | $ 0.05 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent Event [Member] | Series B [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock dividends declared |  |  |  |  |  |  |  | $ 0.453125 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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