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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 2015
Cash and Cash Equivalents [Abstract]  
Cash, cash equivalents and investments
Investments as of June 30, 2015 and December 31, 2014 consisted of the following (in thousands):
 
 
Amortized
 
Unrealized
 
Aggregate Fair
Investment Classification
 
Cost
 
Gains
 
(Losses)
 
Market Value
June 30, 2015
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
11,535

 
$
14

 
$
(5
)
 
$
11,544

Corporate bonds
 
233,923

 
7

 
(56
)
 
233,874

U.S. Government bonds
 
5,460

 
—

 
(4
)
 
5,456

 
 
$
250,918

 
$
21

 
$
(65
)
 
$
250,874

December 31, 2014
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
11,373

 
$
4

 
$
(13
)
 
$
11,364

Corporate bonds
 
228,799

 
14

 
(41
)
 
228,772

U.S. Government bonds
 
5,999

 
—

 
—

 
5,999

 
 
$
246,171

 
$
18

 
$
(54
)
 
$
246,135