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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 16, 2017 | Sep. 15, 2017 | Aug. 16, 2017 | Aug. 01, 2017 | Sep. 30, 2017 | Aug. 24, 2017 | Dec. 31, 2016 | Aug. 01, 2016
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 91,319,000 |  | 85,316,000 |
Dividends payable, date declared |  |  |  |  | Oct. 16, 2017 |  |  |
Dividends payable, date to be paid |  |  |  |  | Nov. 20, 2017 |  |  |
Dividends payable, date of record |  |  |  |  | Nov. 10, 2017 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, dividends declared | $ 0.05 |  |  |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  |  | 6.50% |  |  |
Liquidation preference, per share |  |  |  |  | $ 25.00 |  | $ 25.00 |
Redemption price per share |  |  |  |  | $ 25.00 |  |  |
Redemption date |  |  |  |  | Aug. 24, 2022 |  |  |
Preferred stock, shares issued |  |  |  |  | 3,000,000 | 3,000,000 | 0 |
Preferred stock, issued price per share |  |  |  |  |  | $ 25.00 |  |
Public offering, realized net proceeds, net offering expenses |  |  |  |  |  | $ 72.3 |  |
Series C Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock dividends declared | 0.388194 |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  |  | 7.25% |  |  |
Liquidation preference, per share |  |  |  |  | $ 25.00 |  | $ 25.00 |
Redemption price per share |  | $ 25.00 | $ 25.00 |  | $ 25.00 |  |  |
Redemption date |  |  |  |  | May 22, 2017 |  |  |
Preferred stock, shares issued |  |  |  |  | 3,450,000 |  | 7,950,000 |
Preferred stock redeemed, shares |  | 3,000,000 | 1,500,000 |  |  |  |  |
Redemption price plus accrued and unpaid dividends amount |  | $ 75.0 | $ 37.5 |  |  |  |  |
Series B Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock dividends declared | $ 0.453125 |  |  |  |  |  |  |
Forward Sales Agreements [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  | 5,750,000
Public offering, estimated net proceeds |  |  |  | $ 43.2 |  |  |  |
Settlement date of agreements |  |  |  | Aug. 01, 2017 | Aug. 01, 2017 |  |  |

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