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MARKETABLE SECURITIES
 12 Months Ended
Dec. 31, 2013
MARKETABLE SECURITIES  
MARKETABLE SECURITIES

(5) MARKETABLE SECURITIES

        A summary of marketable securities is shown below:

 
   Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  
 
   (In thousands)
  

December 31, 2013

                          

Marketable securities

                          

U.S. government and municipal obligations

                          

Maturing in one year or less

   $ 55,531   $ 27   $ (4 ) $ 55,554  

Maturing after one year through three years          

     18,234     56     (4 )   18,286  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total U.S. government and municipal obligations

   $ 73,765   $ 83   $ (8 ) $ 73,840  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Corporate debt securities

                          

Maturing in one year or less

   $ 38,973   $ 9   $ (9 ) $ 38,973  

Maturing after one year through three years          

     20,761     12     (5 )   20,768  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total corporate debt securities

   $ 59,734   $ 21   $ (14 ) $ 59,741  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total marketable securities

   $ 133,499   $ 104   $ (22 ) $ 133,581  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

 
   Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  
 
   (In thousands)
  

December 31, 2012

                          

Marketable securities

                          

U.S. government and municipal obligations

                          

Maturing in one year or less

   $ 15,566   $ 28   $ —   $ 15,594  

Maturing after one year through three years

     19,797     99     (1 )   19,895  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total U.S. government and municipal obligations          

   $ 35,363   $ 127   $ (1 ) $ 35,489  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Corporate debt securities

                          

Maturing in one year or less

   $ 17,353   $ 23   $ (4 ) $ 17,372  

Maturing after one year through three years

     6,193     14     (3 )   6,204  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total corporate debt securities

   $ 23,546   $ 37   $ (7 ) $ 23,576  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total marketable securities

   $ 58,909   $ 164   $ (8 ) $ 59,065  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

        The marketable securities held by the Company were high investment grade and there were no marketable securities that the Company considered to be other-than-temporarily impaired as of December 31, 2013.