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Earnings Per Share (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Weighted average nonvested restricted shares outstanding	3,400,000	3,700,000	3,500,000	3,700,000
Weighted average number of OP units outstanding	375,000	395,000	387,000	447,000

X

- Definition

Weighted Average Number Of Operating Partnership Units Outstanding

+ References

No definition available.

+ Details

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Namespace Prefix:	cdr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

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X

- Definition

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



-Section 45



-Paragraph 61A



-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780137-109256



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Participating Security



-URI http://asc.fasb.org/extlink&oid=6519812



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



-Section 45



-Paragraph 60A



-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



-Section 45



-Paragraph 59A



-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780131-109256



Reference 5: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



-Section 45



-Paragraph 60B



-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256



Reference 6: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



-Section 45



-Paragraph 68B



-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5498026-109256

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration