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Summary of Significant Accounting Policies (Details Textuals 1) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Jun. 02, 2010
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |  |  |
Prior period depreciation and Amortization adjustment |  | $ 4.7 |  |  |  |  |  |  |
Development expense for land | 7.7 |  |  |  | 7.7 |  |  |  |
Revenue increased by straight-line rent adjustment | 4.9 |  |  | 3.1 | 13.2 | 7.0 |  |  |
Increased revenue due to amortization of deferred rent | 0.6 |  |  | 0.6 | 1.7 | 2.2 |  |  |
Decrease in revenue due to amortization of lease incentives | 0.4 |  |  | 0.2 | 1.0 | 1.2 |  |  |
Increase in Common shares available for future awards |  |  |  |  |  |  |  |  | 6,000,000
Increase in shares due to amendments in plan, shares solely available for options and share appreciation rights |  |  |  |  |  |  |  |  | 3,600,000
Common shares available for future awards | 5,788,395 |  |  |  | 5,788,395 |  |  |  |
Common shares available for options and stock appreciation rights | 4,578,737 |  |  |  | 4,578,737 |  |  |  |
Options awarded, term |  |  |  |  | one to ten-year |  |  |  |
Stock-based compensation expense | 1.6 |  |  | 1.7 | 4.9 | 4.8 |  |  |
Stock-based compensation expense, capitalized | 0.4 |  |  | 0.4 | 1.1 | 1.0 |  |  |
Additional income related to electricity charges |  |  | 0.5 |  |  |  |  |  |
Overstatement of revenue due to under billing |  |  | 0.5 |  |  |  |  |  |
Understatement of Revenue |  |  |  |  |  |  | 0.3 | 0.2 |
Distributable income minimum percentage |  |  |  |  | 90.00% |  |  |  |
Outstanding purchase money mortgage | $ 7.2 |  |  |  | $ 7.2 |  |  |  |
Purchase money mortgage loan repayments terms |  |  |  |  | start in 2012, to be fully paid in 2014 |  |  |  |

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