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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2013
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Investments
Investments at March 31, 2013 consisted of the following (in thousands):

 
 
Amortized
 
Unrealized
 
Aggregate Fair
Investment Classification
 
Cost
 
Gains
 
(Losses)
 
Market Value
March 31, 2013 –
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
8,447

 
$
4

 
$
(7
)
 
$
8,444

Commercial paper
 
1,998

 
—

 
—

 
1,998

Corporate bonds
 
162,356

 
12

 
(30
)
 
162,338

U.S. government bonds
 
3,099

 
—

 
—

 
3,099

Convertible notes
 
4,300

 
—

 
—

 
4,300

 
 
$
180,200

 
$
16

 
$
(37
)
 
$
180,179



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