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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of Estimated Fair Values of Financial Instruments

The carrying amounts and estimated fair values of these financial instruments (all are liabilities) at June 30, 2013, are as follows (in thousands):

 

     Carrying     Estimated  
     Amount     Fair Value  

Notes Payable

   $ 2,705      $ 2,660   

Zero-coupon notes

     230        224   

Debentures

     537        479   

Senior notes

     1,771        1,761   

Long-term notes

     225        221   

Less unamortized discount

     (150     —     
  

 

 

   

 

 

 

Net liabilities

   $ 5,318      $ 5,345