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Real Estate (Narrative) (Details) (USD $)	6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Quartermaster Plaza [Member]	Mar. 21, 2014 Quartermaster Plaza [Member]	Jun. 30, 2014 Quartermaster Plaza [Member] Mortgage Loan Payable Maturing October 2015 [Member]	Mar. 21, 2014 Quartermaster Plaza [Member] Mortgage Loan Payable Maturing October 2015 [Member]	Jun. 30, 2014 Quartermaster Plaza [Member] Mortgage Loan Payable Maturing October 2014 [Member]	Mar. 21, 2014 Quartermaster Plaza [Member] Mortgage Loan Payable Maturing October 2014 [Member]	Jul. 18, 2014 Carbondale Plaza [Member] Subsequent Event [Member]
Real Estate Properties [Line Items]
Purchase price of acquired property				$ 92,300,000
Mortgage amount				53,400,000		42,100,000		11,300,000
Mortgage interest rate						5.30%		5.50%
Mortgage maturity date			Oct. 01, 2014		Oct. 01, 2015		Oct. 01, 2014
Sales price of real estate sold									10,700,000
Acquisition costs	2,870,000
Assets of properties held for sale/conveyance	37,400,000
Liabilities of properties held for sale/conveyance	7,700,000
Mortgage loans payable - real estate held for sale/conveyance	6,618,000	29,832,000
Unamortized intangible lease liabilities - real estate held for sale/conveyance	$ 1,092,000	$ 5,463,000

X

- 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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X

- Definition

Purchase Price Of Acquired Property

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Real Estate Held For Sale, Assets

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Real Estate Held For Sale, Liabilities

+ References

No definition available.

+ Details

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Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460

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- Definition

Face (par) amount of debt instrument at time of issuance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

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- Definition

Liability (such as a mortgage) related to a disposal group that is held for sale and anticipated to be sold in less than one year. The liability is expected to be discharged as part of the plan of sale for the asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15)

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759



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-Name Accounting Standards Codification

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-Paragraph 2

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- Definition

Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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