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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 2014
Cash and Cash Equivalents [Abstract]  
Cash, cash equivalents and investments
Investments as of June 30, 2014 and December 31, 2013 consisted of the following (in thousands):
 
 
Amortized
 
Unrealized
 
Aggregate Fair
Investment Classification
 
Cost
 
Gains
 
(Losses)
 
Market Value
June 30, 2014
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
10,985

 
$
7

 
$
(11
)
 
$
10,981

Corporate bonds
 
203,841

 
40

 
(6
)
 
203,875

U.S. Government bonds
 
2,998

 
—

 
(1
)
 
2,997

Convertible notes
 
—

 
—

 
—

 
—

 
 
$
217,824

 
$
47

 
$
(18
)
 
$
217,853

December 31, 2013
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
11,358

 
$
2

 
$
(16
)
 
$
11,344

Corporate bonds
 
190,738

 
33

 
(48
)
 
190,723

U.S. Government bonds
 
3,074

 
—

 
—

 
3,074

Convertible notes
 
4,300

 
—

 
—

 
4,300

 
 
$
209,470

 
$
35

 
$
(64
)
 
$
209,441