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Long-Term Investments (Tables)
9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Securities

The following is a summary of available-for-sale securities (in thousands):

 

September 30, 2016

   Cost      Gross
Unrealized
Gains
     Gross
Unrealized
Losses
     Estimated
Fair
Value
 

Failed Auction Security

   $ 3,000      $ —        $ 420      $ 2,580  
  

 

 

    

 

 

    

 

 

    

 

 

 

 

December 31, 2015

   Cost      Gross
Unrealized
Gains
     Gross
Unrealized
Losses
     Estimated
Fair
Value
 

Failed Auction Security

   $ 3,000      $ —        $ 474      $ 2,526  

Brokered certificates of deposit

     340        —          —          340  
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 3,340      $ —        $ 474      $ 2,866  
  

 

 

    

 

 

    

 

 

    

 

 

 
Amortized Cost and Estimated Fair Value of Failed Auction Securities by Contractual Maturities

The amortized cost and estimated fair value of the Failed Auction Security on September 30, 2016, by contractual maturity, is shown below (in thousands):

 

     Cost      Estimated
Fair Value
 

Due in twenty-six years

   $ 3,000      $ 2,580  
  

 

 

    

 

 

 
Rollforward of Credit (Gain) Loss Recognized in Earnings on Failed Auction Security

The following table represents a rollforward of the activity related to the credit loss recognized in earnings on the Failed Auction Security for the nine months ended September 30 (in thousands):

 

     2016      2015  

Balance at the beginning of the period

   $ 72      $ 84  

Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized

     (10      (12
  

 

 

    

 

 

 

Balance at the end of the period

   $ 62      $ 72