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Shareholders' Equity (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
OP units converted | 1,134,000 |
Mezzanine Operating Partnership Units [Member] |  |
OP units converted | 564,000 |
Carrying value of OP Units reclassified to equity | $ 3,900,000 |
Series B [Member] |  |
Public offering, shares | 400,000 |
Liquidation preference, per share | $ 25.00 | $ 25.00
Redemption price per share | $ 25.00 |
Public offering, per share | $ 23.00 |
Public offering, realized net proceeds, net offering expenses | 8,600,000 |
ATM equity program additional shares available to sell | 4,000,000 |
ATM equity program, shares issued | 53,000 |
ATM equity program, weighted average price per share | $ 23.15 |
ATM equity program, realized net proceeds, net offering expenses | 1,200,000 |
Dividend rate percentage | 7.25% |
Series A [Member] |  |
Liquidation preference, per share | $ 25.00 | $ 25.00
Dividend rate percentage | 8.875% |
Shares of Redeemable Preferred Stock redeemed and purchased | 380,000 |
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased | 9,600,000 |
Preferred stock accrued dividends | $ 89,000 |

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- Definition Total change in each class of partners' capital accounts during the year due to exchanges and conversions. Partners include general, limited and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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