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Shareholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2020 | Jan. 12, 2018 | Dec. 15, 2017 | Sep. 15, 2017 | Aug. 24, 2017 | Aug. 16, 2017 | Aug. 01, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 18, 2018
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  | 12,500,000 |  |  |
Net proceeds from sale of preferred stock |  |  |  |  |  |  |  |  |  | $ 120,432,000 |
Common stock repurchase, authorized |  |  |  |  |  |  |  |  |  |  | $ 30,000,000
Common stock repurchase, shares |  |  |  |  |  |  |  |  | 772,000 |  |
Common stock repurchase, weighted average price per share |  |  |  |  |  |  |  |  | $ 3.02 |  |
Additional number of common stock shares repurchased |  |  |  |  |  |  |  | 2,050,000 |  |  | 2,823,000
Additional common stock repurchased, weighted average price per share |  |  |  |  |  |  |  | $ 3.34 |  |  | $ 3.25
Common stock, shares issued |  |  |  |  |  |  |  | 89,020,000 | 90,436,000 |  |
Stock price as percentage of market value |  |  |  |  |  |  |  | 100.00% |  |  |
Remaining shares authorized under DRIP |  |  |  |  |  |  |  | 2,828,000 |  |  |
Accrued preferred stock dividends |  |  |  |  |  |  |  | $ 1,200,000 | $ 1,200,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date declared | Jan. 16, 2020 |  |  |  |  |  |  |  |  |  |
Common stock, dividends declared | $ 0.05 |  |  |  |  |  |  |  |  |  |
Dividends payable, date to be paid | Feb. 20, 2020 |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record | Feb. 10, 2020 |  |  |  |  |  |  |  |  |  |
Forward Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  | 5,750,000 |  |  |  |
Settlement date of agreements |  |  |  |  |  |  | Aug. 01, 2017 |  |  |  |
Public offering, estimated net proceeds |  |  |  |  |  |  | $ 43,200,000 |  |  |  |
Series B [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  |  |  |  |  | 7.25% | 7.25% | 7.25% |
Redemption date |  |  |  |  |  |  |  | May 22, 2017 |  |  |
Redemption price per share |  | $ 25.00 |  | $ 25.00 |  | $ 25.00 |  | $ 25.00 |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  | 1,450,000 | 1,450,000 |  |
Preferred stock redeemed, shares |  | 2,000,000 |  | 3,000,000 |  | 1,500,000 |  |  |  |  |
Redemption price plus accrued and unpaid dividends amount |  | $ 50,000,000 |  | $ 75,000,000 |  | $ 37,500,000 |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  |  |  |  |  | 6.50% | 6.50% | 6.50% |
Redemption price per share |  |  |  |  |  |  |  | $ 25.00 |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  | 6,450,000 | 6,450,000 |  |
Common stock sales, net of issuance expenses, shares |  |  | 2,000,000 |  | 3,000,000 |  |  |  |  |  |
Shares Issued, price per share |  |  | $ 25.00 |  | $ 25.00 |  |  |  |  |  |
Net proceeds from sale of preferred stock |  |  | $ 48,100,000 |  | $ 72,300,000 |  |  |  |  |  |
Series C [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends declared | $ 0.406250 |  |  |  |  |  |  |  |  |  |

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