Real Property Acquisitions and Development (Details) (USD $) In Thousands, except Per Share data	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Pro forma consolidated results of operations
Revenues	$ 1,074,416	$ 632,555
Income from continuing operations attributable to common stockholders	$ 87,113	$ 66,733
Income from continuing operations attributable to common stockholders per share:
Basic	$ 0.48	$ 0.44
Diluted	$ 0.48	$ 0.43

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph r(2, 3)

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 54

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 55

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period

+ References

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The pro forma net income (loss) for the period as if the business combination or combinations had been completed at the beginning of a period

+ References

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period

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