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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Jun. 02, 2010
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |
Development costs for land | $ 7.8 |  |
Revenue increased by straight-line rent adjustment | 6.3 | 4.2 |
Increased revenue due to amortization of deferred rent | 0.6 | 0.6 |
Decrease in revenue due to amortization of lease incentives | 0.4 | 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 | 3,599,672 |  | 3,600,000
Common shares available for future awards | 5,272,117 |  |
Options awarded, term | one to ten-year |  |
Award vesting term, minimum | 1 year |  |
Award vesting term, maximum | 10 years |  |
Stock-based compensation expense | 1.7 | 1.6 |
Stock-based compensation expense, capitalized | 0.4 | 0.3 |
Distributable income minimum percentage | 90.00% |  |
PJP VII [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value | $ 0.7 |  |

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