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Income Taxes (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Income Taxes    
Maximum ownership as a percentage of the voting power or value of the securities of each issuer other than REIT or "TRS" 10.00%  
Maximum ownership of securities in all TRS (as a percent) 25.00%  
Maximum ownership of securities in all TRS when considered together with other non-real estate assets (as a percent) 25.00%  
Period of statute of limitations applicable to the entity's income tax returns (in years) 3  
Increase (decrease) in taxes resulting from:    
Revised Texas Franchise tax rate (as a percent) 0.70%  
Real estate assets net tax basis more (less) than book basis $ 77,000 $ 50,000
Revised Texas franchise tax 77,000 50,000
Other Taxes 2,000  
Income tax expense $ 79,000 $ 50,000