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Shareholders' Equity (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Aug. 06, 2013 | Dec. 31, 2002 | Dec. 31, 2012 Mezzanine OP Units [Member] | Feb. 12, 2013 Series B [Member] | Sep. 11, 2012 Series B [Member] | May 31, 2012 Series B [Member] | Dec. 31, 2013 Series B [Member] | Dec. 31, 2012 Series B [Member] | Dec. 31, 2011 Series B [Member] | Sep. 14, 2012 Series B [Member] | Mar. 11, 2013 Series A [Member] | Dec. 31, 2013 Series A [Member] | Dec. 31, 2012 Series A [Member] | Dec. 31, 2011 Series A [Member] | Dec. 31, 2013 Limited Partners' OP Units [Member] | Dec. 31, 2013 Mezzanine OP Units [Member] | Jan. 27, 2014 Subsequent Event [Member] | Dec. 31, 2013 Subsequent Event [Member] | Jan. 27, 2014 Subsequent Event [Member] Series B [Member] | Jan. 13, 2014 Subsequent Event [Member] Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OP units converted | 3,000 | 1,134,000 |  |  |  | 564,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of OP Units reclassified to equity |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in public offering |  |  |  |  |  |  | 2,000,000 | 4,200,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000
Dividend rate percentage |  |  |  |  |  |  |  |  |  | 7.25% | 7.25% | 7.25% |  |  | 8.875% | 8.875% | 8.875% |  |  |  |  |  |
Public offering, per share |  |  |  |  |  |  | $ 24.58 | $ 23.94 | $ 23.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public offering, realized net proceeds, net offering expenses |  |  |  |  |  |  | 47,600,000 | 96,800,000 | 8,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares issued to underwriters |  |  |  |  |  |  | 300,000 |  |  |  |  |  | 630,000 |  |  |  |  |  |  |  |  |  | 900,000
Net proceeds realized from issuance of additional shares to underwriters |  |  |  |  |  |  | 7,100,000 |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |  |  |  | 41,300,000
ATM equity program, shares issued |  |  |  |  |  |  |  |  |  | 221,000 | 199,000 |  |  |  |  |  |  |  |  |  |  |  |
At-the-market program, shares authorized |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ATM equity program, weighted average price per share |  |  |  |  |  |  |  |  |  | $ 24.52 | $ 23.23 |  |  |  |  |  |  |  |  |  |  |  |
ATM equity program, realized net proceeds, net offering expenses |  |  |  |  |  |  |  |  |  | 5,200,000 | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference, per share |  |  |  |  |  |  |  |  |  | $ 25.00 | $ 25.00 |  |  |  | $ 25.00 | $ 25.00 |  |  |  |  |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |
Shares of Redeemable Preferred Stock redeemed and purchased |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,408,000 |  | 4,992,000 |  |  |  |  |  |  |
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,400,000 |  | 126,400,000 |  |  |  |  |  |  |
Preferred stock redemption costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |
Preferred stock accrued dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |
Stock price as percentage of market value | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares authorized under DRIP | 2,852,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemptions of OP Units, shares | 32,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 |  |  |  |
Cash outlay for redeemed OP units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 170,000 |  |  |  |  |
Issuance of OP Units in connection with a property acquisition | 270,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of OP units called by warrants |  |  |  |  | 83,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price |  |  |  |  | $ 13.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | (64,000) | (172,000) | 4,305,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.05 |  |  |
Preferred stock dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.453125 |
Dividends payable, date declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 27, 2014 |  |
Dividends payable, date to be paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 20, 2014 |  |
Dividends payable, date of record |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 10, 2014 |  |
Accrued preferred stock dividends | $ 1,600,000 | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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