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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2011
Stockholders' Equity [Abstract] |
Common stock outstanding, including unvested restricted shares of common stock |
|  | Shares of Common Stock Outstanding |
Balance at December 31, 2008 |  |  | 44,652,182 |
Issuance of Common Stock, including Issuance of Restricted Stock Units |  |  | 16,874,884 |
Issuance of Restricted Stock Shares |  |  | 35,145 |
Repurchase and Retirement of Restricted Stock Shares |  |  | (132,463 | )
Conversion of Operating Partnership Units |  |  | 415,466 |
Balance at December 31, 2009 |  |  | 61,845,214 |
Issuance of Common Stock, including Issuance of Restricted Stock Units |  |  | 6,518,736 |
Issuance of Restricted Stock Shares |  |  | 573,198 |
Repurchase and Retirement of Restricted Stock Shares |  |  | (123,438 | )
Conversion of Operating Partnership Units |  |  | 27,586 |
Balance at December 31, 2010 |  |  | 68,841,296 |
Issuance of Common Stock, including Issuance of Restricted Stock Units |  |  | 17,646,586 |
Issuance of Restricted Stock Shares |  |  | 292,339 |
Repurchase and Retirement of Restricted Stock Shares |  |  | (98,603 | )
Conversion of Operating Partnership Units |  |  | 125,784 |
Balance at December 31, 2011 |  |  | 86,807,402 |
Dividend Distributions |
|  | Year Ended 2011 |  |  | Year Ended 2010 |  |  | Year Ended 2009 |
|  | Dividend/ Distribution per Share/ Unit |  |  | Total Dividend/ Distribution |  |  | Dividend/ Distribution per Share/ Unit |  |  | Total Dividend/ Distribution |  |  | Dividend/ Distribution per Share/ Unit |  |  | Total Dividend/ Distribution |
Common Stock/Operating Partnership Units |  | $ | 0.0000 |  |  | $ | — |  |  | $ | 0.0000 |  |  | $ | — |  |  | $ | 0.0000 |  |  | $ | — |
Series F Preferred Stock |  | $ | 6,510.9028 |  |  | $ | 3,256 |  |  | $ | 6,736.1540 |  |  | $ | 3,368 |  |  | $ | 6,414.5700 |  |  | $ | 3,207 |
Series G Preferred Stock |  | $ | 7,236.0000 |  |  | $ | 1,809 |  |  | $ | 7,236.0000 |  |  | $ | 1,809 |  |  | $ | 7,236.0000 |  |  | $ | 1,809 |
Series J Preferred Stock |  | $ | 18,125.2000 |  |  | $ | 10,875 |  |  | $ | 18,125.2000 |  |  | $ | 10,875 |  |  | $ | 18,125.2000 |  |  | $ | 10,875 |
Series K Preferred Stock |  | $ | 18,125.2000 |  |  | $ | 3,625 |  |  | $ | 18,125.2000 |  |  | $ | 3,625 |  |  | $ | 18,125.2000 |  |  | $ | 3,625 |

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