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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2016
Cash and Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Investments
Investments as of March 31, 2016 and December 31, 2015 consisted of the following (in thousands):
 
 
Amortized
 
Unrealized
 
Aggregate Fair
Investment Classification
 
Cost
 
Gains
 
(Losses)
 
Market Value
March 31, 2016
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
11,513

 
$
8

 
$
(3
)
 
$
11,518

Corporate bonds
 
229,513

 
—

 
(122
)
 
229,391

U.S. Government bonds
 
44,962

 
—

 
(281
)
 
44,681

 
 
$
285,988

 
$
8

 
$
(406
)
 
$
285,590

December 31, 2015
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
11,532

 
$
3

 
$
(14
)
 
$
11,521

Corporate bonds
 
233,848

 
—

 
(139
)
 
233,709

U.S. Government bonds
 
54,953

 
1

 
(16
)
 
54,938

 
 
$
300,333

 
$
4

 
$
(169
)
 
$
300,168