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Summary Of Significant Accounting Policies (Supplemental Consolidated Statements Of Cash Flows Information) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Supplemental disclosure of cash activities:
Cash paid for interest	$ 7,242,000us-gaap_InterestPaid	$ 8,531,000us-gaap_InterestPaid
Supplemental disclosure of non-cash activities:
Capitalization of interest and financing costs	163,000us-gaap_InterestCostsCapitalized	201,000us-gaap_InterestCostsCapitalized
Mortgage loans payable assumed upon acquisition		(53,439,000)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
Conversions of OP Units into common stock		$ 371,000cdr_ConversionOfOperatingPartnershipUnitsIntoCommonStock

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Conversion Of Operating Partnership units Into Common Stock

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Amount of interest capitalized during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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