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Balance Sheet Information (Details 4) (Mortgage Payable, USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Mortgage Payable
   
Debt    
Mortgage payable outstanding $ 2.2 $ 2.4
Annual interest rate accrued on mortgage (as a percent) 7.91%  
Fair value of debt instrument $ 2.4 $ 2.6