Annual report pursuant to Section 13 and 15(d)

Real Estate Joint Ventures (Details 2)

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Real Estate Joint Ventures (Details 2) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
LW Redstone Company, LLC
Dec. 31, 2011
LW Redstone Company, LLC
Maximum
Dec. 31, 2011
M Square Associates, LLC
Investments in real estate joint ventures          
Percentage of residual amounts distributed to each member         50.00%
Percentage of distributable cash in excess of preferred returns entitled to the entity     85.00%    
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars)       $ 76,000,000  
Amounts advanced to fund Huntsville infrastructure costs $ 27,998,000 $ 18,870,000 $ 17,700,000