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Shareholders' Equity (Narrative) (Details) (USD $) | 0 Months Ended | 6 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2014 | Jun. 30, 2014 | Jan. 13, 2014 | Jul. 01, 2014 Limited Partners' Interest In Operating Partnership [Member] | Jul. 21, 2014 Subsequent Event [Member] | Jul. 21, 2014 Subsequent Event [Member] Series B [Member]
Class of Stock [Line Items] |  |  |  |  |  |
Public offering, shares |  |  | 6,900,000 |  |  |
Shares issued to underwriters |  |  | 900,000 |  |  |
Public offering, realized net proceeds, net offering expenses |  |  | $ 41,300,000 |  |  |
At-the-market program, shares authorized |  | 10,000,000 |  |  |  |
At-the-market program, shares sold |  | 0 |  |  |  |
Redemptions of OP Units, shares | 69,000 |  |  |  |  |
Cash outlay for redeemed OP units |  |  |  | $ 424,000 |  |
Common stock, dividends declared |  |  |  |  | $ 0.05 |
Preferred stock dividends declared |  |  |  |  |  | $ 0.453125
Dividends payable, date declared |  | Jul. 21, 2014 |  |  |  |
Dividends payable, date to be paid |  | Aug. 20, 2014 |  |  |  |
Dividends payable, date of record |  | Aug. 08, 2014 |  |  |  |

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