Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events Acquisition of Land in Houston, Texas (Details)

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Subsequent Events Acquisition of Land in Houston, Texas (Details) (Joint Venture Acquisition of Property [Member], USD $)
In Millions
3 Months Ended
Jun. 30, 2011
Joint Venture Acquisition of Property [Member]
 
Subsequent Event [Line Items]  
Subsequent Event, Date Jul. 27, 2011
Purchase Price of Land Acquired $ 5.6