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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2011
Fair Value of Financial Instruments [Abstract]  
Fair Value of Financial Instruments
Note 11. Fair Value of Financial Instruments
     The carrying amounts of cash and cash equivalents, receivables and payables are reasonable estimates of their fair value as of June 30, 2011 and December 31, 2010 due to their short-term nature. The fair value of notes and bonds payable is estimated using cash flow analyses, based on the Company’s current interest rates for similar types of borrowing arrangements. The fair value of mortgage notes and notes receivable is estimated either based on cash flow analyses at an assumed market rate of interest or at a rate consistent with the rates on mortgage notes acquired by the Company recently or notes receivable entered into by the Company recently. The table below details the fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable at June 30, 2011 and December 31, 2010.
                                 
    June 30, 2011     December 31, 2010  
    Carrying     Fair     Carrying     Fair  
(Dollars in millions)   value     value     value     value  
 
Notes and bonds payable
  $ 1,251.6     $ 1,323.0     $ 1,407.9     $ 1,460.2  
Mortgage notes receivable
  $ 122.6     $ 117.6     $ 36.6     $ 35.9  
Notes receivable, net of allowances
  $ 0.3     $ 0.3     $ 3.8     $ 3.8