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Shareholders' Equity (Narrative) (Details) - $ / shares |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 19, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |
Dividends payable, date declared |  | Apr. 19, 2016 |
Dividends payable, date to be paid |  | May 20, 2016 |
Dividends payable, date of record |  | May 10, 2016 |
Series B [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend rate percentage |  | 7.25% |
Liquidation preference, per share |  | $ 25.00 | $ 25.00
Subsequent Event [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, dividends declared | $ 0.05 |  |
Subsequent Event [Member] | Series B [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared | $ 0.453125 |  |

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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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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