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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 17, 2017 | Aug. 01, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 12, 2015
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares issued |  |  | 85,316,000 | 85,049,000 | 5,750,000
Shares issued to underwriters |  |  |  |  | 750,000
Public offering, realized net proceeds, net offering expenses |  |  |  |  | $ 41.9
At-the-market program, shares sold |  |  |  | 0 |
Stock price as percentage of market value |  |  | 100.00% |  |
Remaining shares authorized under DRIP |  |  | 2,841,000 |  |
OP units converted |  |  |  | 40,000 |
Accrued preferred stock dividends |  |  | $ 1.6 | $ 1.6 |
Dividends payable, date declared |  |  | Jan. 17, 2017 |  |
Dividends payable, date to be paid |  |  | Feb. 21, 2017 |  |
Dividends payable, date of record |  |  | Feb. 10, 2017 |  |
Subsequent Event [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, dividends declared | $ 0.05 |  |  |  |
Forward Sales Agreement [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares issued |  | 5,750,000 |  |  |
Public offering, estimated net proceeds |  | $ 44.2 |  |  |
Series B [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 |  |
At-the-market equity program, expiration date |  |  |  | May 29, 2015 |
Series B [Member] | Subsequent Event [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Preferred stock dividends declared | $ 0.453125 |  |  |  |

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