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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | Jul. 18, 2018 | Jan. 12, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Class Of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized |  |  | 12,500,000 |
Subsequent Event [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Dividends payable, date declared | Jul. 18, 2018 |  |  |
Common stock, dividends declared | $ 0.05 |  |  |
Dividends payable, date to be paid | Aug. 20, 2018 |  |  |
Dividends payable, date of record | Aug. 10, 2018 |  |  |
Series B [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized |  |  | 1,450,000 | 3,450,000
Preferred stock redeemed, shares |  | 2,000,000 |  |
Redemption price per share |  | $ 25.00 |  |
Redemption price plus accrued and unpaid dividends amount |  | $ 50.0 |  |
Series B [Member] | Subsequent Event [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred stock dividends declared | $ 0.453125 |  |  |
Series C [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized |  |  | 6,450,000 | 6,450,000
Series C [Member] | Subsequent Event [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred stock dividends declared | $ 0.406250 |  |  |

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