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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 21, 2016 | Aug. 01, 2016 | Sep. 30, 2016 | Dec. 31, 2015
Class Of Stock [Line Items] |  |  |  |
Common stock, shares issued |  |  | 85,333,000 | 85,049,000
Dividends payable, date declared |  |  | Oct. 25, 2016 |
Dividends payable, date to be paid |  |  | Nov. 21, 2016 |
Dividends payable, date of record |  |  | Nov. 11, 2016 |
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 |  |  |
Forward Sales Agreement [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock, shares issued |  | 5,750,000 |  |
Public offering, estimated net proceeds |  | $ 44.2 |  |

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