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Summary of Significant Accounting Policies (Impairment or Disposal of Long-Lived Assets/ Revenue Recognition/ Stock-Based Compensation Plans) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Jun. 02, 2010
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |
Development expense for land | $ 7.7 |  |  |  |
Revenue increased by straight-line rent adjustment | 17.9 | 10.9 | 6.4 |  |
Increased revenue due to amortization of deferred rent | 2.4 | 2.8 | 2.7 |  |
Decrease in revenue due to amortization of lease incentives | 1.6 | 1.5 | 1.8 |  |
Additional income related to electricity charges | 0.5 |  |  |  |
Overstatement of revenue due to under billing | (0.5) |  |  |  |
Understatement of Revenue |  |  | 0.3 | 0.2 |
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 | 3,971,774 |  |  |  | 3,600,000
Common shares available for future awards | 5,789,202 |  |  |  |
Options awarded, term | one to ten-year |  |  |  |
Award vesting term, minimum | 1 year |  |  |  |
Award vesting term, maximum | 10 years |  |  |  |
Stock-based compensation expense | 6.4 | 6.1 | 5.3 |  |
Stock-based compensation expense, capitalized | $ 1.5 | $ 1.3 | $ 0.8 |  |
Requirement to commence development by 2012 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |
Number of parcels of land under option for ground lease | 2 |  |  |  |

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