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Earnings Per Share (Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Income from continuing operations									$ 17,611,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 4,519,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 24,094,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Preferred stock dividends									(14,408,000)us-gaap_PreferredStockDividendsIncomeStatementImpact	(14,413,000)us-gaap_PreferredStockDividendsIncomeStatementImpact	(14,819,000)us-gaap_PreferredStockDividendsIncomeStatementImpact
Preferred stock redemption costs										(1,166,000)us-gaap_PreferredStockRedemptionPremium	(4,998,000)us-gaap_PreferredStockRedemptionPremium
Net loss attributable to noncontrolling interests									358,000us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	247,000us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	375,000us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
Net earnings allocated to unvested shares									(734,000)us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities	(758,000)us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities	(806,000)us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities
Income (loss) from continuing operations attributable to vested common shares									2,827,000cdr_IncomeLossFromContinuingOperationsBasicAndDiluted	(11,571,000)cdr_IncomeLossFromContinuingOperationsBasicAndDiluted	3,846,000cdr_IncomeLossFromContinuingOperationsBasicAndDiluted
Income from discontinued operations, net of noncontrolling interests, attributable to vested common shares									11,012,000cdr_IncomeLossFromDiscontinuedOperationsNetOfNoncontrollingInterests	9,682,000cdr_IncomeLossFromDiscontinuedOperationsNetOfNoncontrollingInterests	5,237,000cdr_IncomeLossFromDiscontinuedOperationsNetOfNoncontrollingInterests
Net income (loss) attributable to vested common shares outstanding									$ 13,839,000cdr_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted	$ (1,889,000)cdr_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted	$ 9,083,000cdr_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted
Weighted average number of vested common shares outstanding									75,311,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	68,381,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	68,017,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Earnings (loss) per vested common share, basic and diluted
Continuing operations									$ 0.04us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.17)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ 0.05us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Discontinued operations									$ 0.14us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.14us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.08us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Earnings (loss) per vested common share, basic and diluted	$ 0.01us-gaap_EarningsPerShareBasicAndDiluted	$ 0.03us-gaap_EarningsPerShareBasicAndDiluted	$ 0.17us-gaap_EarningsPerShareBasicAndDiluted	$ (0.03)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.03us-gaap_EarningsPerShareBasicAndDiluted	$ (0.05)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.01us-gaap_EarningsPerShareBasicAndDiluted	$ (0.02)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.18us-gaap_EarningsPerShareBasicAndDiluted	$ (0.03)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.13us-gaap_EarningsPerShareBasicAndDiluted

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Income Loss From Discontinued Operations Net Of Noncontrolling Interests

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Net Income Loss Available To Common Stockholders Basic And Diluted

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of income (loss) from continuing operations attributable to the noncontrolling interest. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period.

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Earnings allocated (not distributed) to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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