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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended |
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 02, 2010 | Jun. 30, 2012 PJP VII [Member] | Jun. 30, 2012 Restricted Stock [Member] | Jun. 30, 2011 Restricted Stock [Member] | Jun. 30, 2012 Restricted Stock [Member] | Jun. 30, 2011 Restricted Stock [Member] | Jun. 30, 2012 Banco Santander Bonds [Member] | Mar. 23, 2012 Banco Santander Bonds [Member]
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash Received for Held-to-Maturity Securities Sold |  |  |  |  |  |  |  |  |  |  | $ 20,009,000 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount |  |  |  |  |  |  |  |  |  |  |  | 50,000,000
Guarantor Obligations, Current Carrying Value |  |  |  |  |  | 700,000 |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Development costs for land | 7,900,000 |  | 7,900,000 |  |  |  |  |  |  |  |  |
Revenue increased by straight-line rent adjustment | 5,300,000 | 4,100,000 | 11,600,000 | 8,300,000 |  |  |  |  |  |  |  |
Increased revenue due to amortization of deferred rent | 600,000 | 600,000 | 1,200,000 | 1,200,000 |  |  |  |  |  |  |  |
Decrease in revenue due to amortization of lease incentives | 100,000 | 400,000 | 500,000 | 600,000 |  |  |  |  |  |  |  |
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 | 4,108,336 |  | 4,108,336 |  | 3,600,000 |  |  |  |  |  |  |
Common shares available for future awards | 5,272,017 |  | 5,272,017 |  |  |  |  |  |  |  |  |
Options awarded, term |  |  | one to ten-year |  |  |  |  |  |  |  |  |
Award vesting term, minimum |  |  | 1 year |  |  |  |  |  |  |  |  |
Award vesting term, maximum |  |  | 10 years |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 1,900,000 | 1,600,000 | 3,600,000 | 3,300,000 |  |  | 800,000 | 800,000 | 1,500,000 | 1,600,000 |  |
Stock-based compensation expense, capitalized | $ 500,000 | $ 400,000 | $ 900,000 | $ 700,000 |  |  | $ 200,000 | $ 100,000 | $ 300,000 | $ 300,000 |  |
Distributable income minimum percentage |  |  | 90.00% |  |  |  |  |  |  |  |  |

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