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Summary of Significant Accounting Policies (Details Textuals 1) (USD $) In Millions, except Share data | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Jun. 02, 2010
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |  |  |
Leasing cost reclassified to capital expenditure |  |  |  |  |  | $ 14.0 |  |  |
Prior period depreciation and Amortization adjustment |  | 4.7 |  |  |  |  |  |  |
Development expense for land | 7.7 | 7.7 |  |  | 7.7 |  |  |  |
Revenue increased by straight-line rent adjustment |  | 4.1 |  | 1.8 | 8.3 | 3.8 |  |  |
Increased revenue due to amortization of deferred rent |  | 0.6 |  | 0.7 | 1.2 | 1.6 |  |  |
Decrease in revenue due to amortization of lease incentives |  | 0.4 |  | 0.3 | 0.6 | 1.0 |  |  |
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 | 5,787,730 | 5,787,730 |  |  | 5,787,730 |  |  |  |
Common shares available for options and stock appreciation rights | 4,550,724 | 4,550,724 |  |  | 4,550,724 |  |  |  |
Options awarded, term | one to ten-year |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 1.6 |  | 1.8 | 3.3 | 3.1 |  |  |
Stock-based compensation expense, capitalized |  | 0.4 |  | 0.4 | 0.7 | 0.6 |  |  |
Additional income related to electricity charges |  |  | 0.5 |  |  |  |  |  |
Overstatement of revenue due to under billing |  |  | 0.5 |  |  |  |  |  |
Understatement of Revenue |  |  |  |  |  |  | $ 0.3 | $ 0.2 |

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