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Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended	0 Months Ended
	Jan. 12, 2015	Mar. 31, 2015	Apr. 20, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Public offering, realized net proceeds, net offering expenses	$ 41.9us-gaap_ProceedsFromIssuanceOfCommonStock
Public offering, shares	5,750,000us-gaap_CommonStockSharesIssued	85,026,000us-gaap_CommonStockSharesIssued		79,213,000us-gaap_CommonStockSharesIssued
Shares issued to underwriters	750,000cdr_SharesIssuedToUnderwriters
Dividends payable, date declared		Apr. 20, 2015
Dividends payable, date to be paid		May 20, 2015
Dividends payable, date of record		May 08, 2015
Subsequent Event [Member]
Class of Stock [Line Items]
Common stock, dividends declared			$ 0.05us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Series B [Member]
Class of Stock [Line Items]
Preferred stock dividends declared			$ 0.453125us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition

Shares Issued To Underwriters

+ References

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+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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