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

Investments classified as short-term consists of the following:

 

    September 30, 2016     December 31, 2015  

Available-for-sale investments:

   

Time deposits and certificates of deposit

  $ 1,395      $ 11,892   

Bankers’ acceptance drafts

    2,487        728   

Asset-backed securities

    18,326        124,997   

Commercial paper

    2,793        —    

Corporate obligations

    16,701        165,109   

Municipal bonds

    593        8,355   

U.S. treasury obligations

    1,152        —    

U.S. agency obligations

    9,657        119,582   
 

 

 

   

 

 

 
  $ 53,104      $ 430,663   
 

 

 

   

 

 

 

Investments classified as long-term consists of the following:

 

    September 30, 2016     December 31, 2015  

Available-for-sale investments:

   

Group insurance contracts

  $ 5,956      $ —    

Cost method investments:

   

Minority interest in Reno Sub-Systems, Inc.

    9,300        —    
 

 

 

   

 

 

 
  $ 15,256      $ —    
 

 

 

   

 

 

 

Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term and Long-Term Securities

The following tables show the gross unrealized gains and (losses) aggregated by investment category for short-term and long-term available-for-sale investments:

 

As of September 30, 2016:    Cost      Gross
Unrealized
Gains
     Gross
Unrealized
(Losses)
     Estimated
Fair
Value
 

Short-term investments:

           

Available-for-sale investments:

           

Time deposits and certificates of deposit

   $ 1,395       $ —        $ —        $ 1,395   

Bankers’ acceptance drafts

     2,487         —          —          2,487   

Asset-backed securities

     18,317         13         (4      18,326   

Commercial paper

     2,794         —           (1      2,793   

Corporate obligations

     16,699         15         (13      16,701   

Municipal bonds

     592         1         —          593   

U.S. treasury obligations

     1,151         1         —          1,152   

U.S. agency obligations

     9,653         4         —          9,657   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 53,088       $ 34       $ (18    $ 53,104   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

As of September 30, 2016:    Cost      Gross
Unrealized
Gains
     Gross
Unrealized
(Losses)
     Estimated
Fair
Value
 

Long-term investments:

           

Available-for-sale investments:

           

Group insurance contracts

   $ 5,988       $ —        $ (32    $ 5,956   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

As of December 31, 2015:    Cost      Gross
Unrealized
Gains
     Gross
Unrealized
(Losses)
     Estimated
Fair
Value
 

Short-term investments:

           

Available-for-sale investments:

           

Time deposits and certificates of deposit

   $ 11,893       $ —        $ (1    $ 11,892   

Bankers’ acceptance drafts

     728         —          —          728   

Asset-backed securities

     125,271         —          (274      124,997   

Corporate obligations

     165,445         5         (341      165,109   

Municipal bonds

     8,346         13         (4      8,355   

U.S. agency obligations

     119,699         3         (120      119,582   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 431,382       $ 21       $ (740    $ 430,663