Real Property Acquisitions and Development (Details) (USD $) In Thousands, except Per Share data	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Pro forma consolidated results of operations
Revenues	$ 689,630	$ 408,005
Income from continuing operations attributable to common stockholders	$ 50,550	$ 73,928
Income from continuing operations attributable to common stockholders per share:
Basic	$ 0.29	$ 0.49
Diluted	$ 0.29	$ 0.48

Income from continuing operations attributable to common stockholders per share.

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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

+ Details

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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

+ References

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