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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2015
Cash and Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Investments
Investments as of March 31, 2015 and December 31, 2014 consisted of the following (in thousands):
 
 
Amortized
 
Unrealized
 
Aggregate Fair
Investment Classification
 
Cost
 
Gains
 
(Losses)
 
Market Value
March 31, 2015
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
11,485

 
$
12

 
$
(5
)
 
$
11,492

Corporate bonds
 
189,903

 
9

 
(29
)
 
189,883

U.S. Government bonds
 
5,999

 
—

 
(1
)
 
5,998

 
 
$
207,387

 
$
21

 
$
(35
)
 
$
207,373

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