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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2013
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Investments
Investments at September 30, 2013 consisted of the following (in thousands):

 
 
Amortized
 
Unrealized
 
Aggregate Fair
Investment Classification
 
Cost
 
Gains
 
(Losses)
 
Market Value
September 30, 2013 –
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
11,103

 
$
2

 
$
(20
)
 
$
11,085

Corporate bonds
 
170,724

 
15

 
(34
)
 
170,705

U.S. government bonds
 
3,074

 
—

 
—

 
3,074

Convertible notes
 
4,300

 
—

 
—

 
4,300

 
 
$
189,201

 
$
17

 
$
(54
)
 
$
189,164



Investments at December 31, 2012 consisted of the following (in thousands):

 
 
Amortized
 
Unrealized
 
Aggregate Fair
Investment Classification
 
Cost
 
Gains
 
(Losses)
 
Market Value
December 31, 2012 –
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
7,562

 
$
3

 
$
(5
)
 
$
7,560

Commercial paper
 
2,997

 
—

 
—

 
2,997

Corporate bonds
 
141,349

 
9

 
(25
)
 
141,333

U.S. government bonds
 
3,098

 
—

 
—

 
3,098

Convertible notes
 
4,300

 
—

 
—

 
4,300

 
 
$
159,306

 
$
12

 
$
(30
)
 
$
159,288