Significant Accounting Policies (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | Oct. 05, 2011 | Jan. 05, 2011 | |
| Significant Accounting Policies [Abstract] | ||||||||
| Rental property in progress | $ 30,948,000 | $ 65,990,000 | $ 30,948,000 | $ 65,990,000 | ||||
| Amortization of deferred financing costs | 584,000 | 646,000 | 1,752,000 | 2,021,000 | ||||
| Deferred leasing costs | 1,099,000 | 872,000 | 3,135,000 | 2,728,000 | ||||
| Minimum percentage of REIT taxable income distributed to shareholders | 90.00% | |||||||
| Preferred stock, shares outstanding | 10,000 | 10,000 | 10,000 | 10,000 | 10,000 | 10,000 | ||
| Common stock, shares outstanding | 87,141,716 | 79,605,474 | 87,141,716 | 79,605,474 | 87,142,004 | 79,605,542 | ||
| Common units outstanding | 12,771,105 | 13,007,668 | 12,771,105 | 13,007,668 | 12,771,105 | 13,007,668 | ||
| Preferred stock dividends per share | $ 50.00 | |||||||
| Preferred stock dividends per share declared | $ 50.00 | |||||||
| Common unit distributions per share | $ 0.45 | $ 0.45 | ||||||
| Restricted stock expense | $ 690,000 | $ 626,000 | $ 2,070,000 | $ 1,869,000 | ||||