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Shareholders' Equity (Details) (USD $) | 9 Months Ended |  |  |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2012 Mezzanine Operating Partnership Units [Member] | Sep. 30, 2012 Series B [Member] | Sep. 14, 2012 Series B [Member] | Sep. 11, 2012 Series B [Member] | May 15, 2012 Series B [Member] | Dec. 31, 2011 Series B [Member] | Oct. 31, 2012 Series A [Member] | Sep. 30, 2012 Series A [Member] | Dec. 31, 2011 Series A [Member]
OP units converted | 1,134,000 | 564,000 |  |  |  |  |  |  |  |
Carrying value of OP Units reclassified to equity |  | $ 3,900,000 |  |  |  |  |  |  |  |
Public offering, shares |  |  |  | 630,000 | 4,200,000 | 400,000 |  |  |  |
Dividend rate percentage |  |  | 7.25% |  |  |  |  |  | 8.875% |
Public offering, per share |  |  |  |  | $ 23.94 | $ 23.00 |  |  |  |
Public offering, realized net proceeds, net offering expenses |  |  |  | 14,500,000 | 96,800,000 | 8,600,000 |  |  |  |
ATM equity program, shares issued |  |  | 199,000 |  |  |  |  |  |  |
ATM equity program, weighted average price per share |  |  | $ 23.23 |  |  |  |  |  |  |
ATM equity program, realized net proceeds, net offering expenses |  |  | 4,500,000 |  |  |  |  |  |  |
Liquidation preference, per share |  |  | $ 25.00 |  |  |  | $ 25.00 |  | $ 25.00 | $ 25.00
Redemption price per share |  |  | $ 25.00 |  |  |  |  |  |  |
Shares of Redeemable Preferred Stock redeemed and purchased |  |  |  |  |  |  |  | 4,500,000 | 487,000 |
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased |  |  |  |  |  |  |  | 114,100,000 | 12,400,000 |
Preferred stock redemption costs |  |  |  |  |  |  |  |  | 181,000 |
Preferred stock accrued dividends |  |  |  |  |  |  |  | $ 1,500,000 | $ 141,000 |

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