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Shareholders' Equity (Narrative) (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 25, 2015 | Jun. 30, 2014 | Jan. 13, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jan. 12, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Public offering, realized net proceeds, net offering expenses |  |  | $ 41,300,000 | $ 41,741,000 | $ 41,163,000 | $ (64,000) |
Public offering, shares |  |  | 6,900,000 | 85,049,000 | 79,213,000 |  | 5,750,000
Shares issued to underwriters |  |  | 900,000 |  |  |  | 750,000
Public offering, realized net proceeds, net offering expenses |  |  |  |  |  |  | $ 41,900,000
At-the-market program, shares sold |  |  |  | 0 | 0 |  |
Stock price as percentage of market value |  |  |  | 100.00% |  |  |
Remaining shares authorized under DRIP |  |  |  | 2,847,000 |  |  |
Redemptions of OP Units, shares |  | 69,000 |  |  |  |  |
OP units converted |  |  |  | 40,000 | 51,000 |  |
Accrued preferred stock dividends |  |  |  | $ 1,600,000 | $ 1,600,000 |  |
Dividends payable, date declared |  |  |  | Jan. 25, 2016 |  |  |
Dividends payable, date to be paid |  |  |  | Feb. 22, 2016 |  |  |
Dividends payable, date of record |  |  |  | Feb. 12, 2016 |  |  |
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 |  |  |
Limited Partners' Interest In Operating Partnership [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash outlay for redeemed OP units |  | $ 424,000 |  | $ 0 | $ 0 |  |
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 |  |  |  |  |  |

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