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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
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 3 years  
Increase (decrease) in taxes resulting from:    
Revised Texas Franchise tax rate (as a percent) 0.70%  
Revised Texas franchise tax $ 117 $ 77
Other Taxes 2 2
Income tax expense 119 79
Deferred income taxes $ 0