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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 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     $ 337 $ 234
Other Taxes     15 2
Income tax expense 118 80 352 236
Deferred income taxes     $ 0