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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 | $ 41.9 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |
Public offering, shares | 5,750,000 us-gaap_CommonStockSharesIssued | 85,026,000 us-gaap_CommonStockSharesIssued |  | 79,213,000 us-gaap_CommonStockSharesIssued
Shares issued to underwriters | 750,000 cdr_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 |  |  | $ 0.05 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent Event [Member] | Series B [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared |  |  | $ 0.453125 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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