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CASH, CASH EQUIVALENTS AND INVESTMENTS
 12 Months Ended
Mar. 31, 2013
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]  
Cash, Cash Equivalents and Investments
CASH, CASH EQUIVALENTS, AND INVESTMENTS

The following table presents the Company's cash, cash equivalents and investments as of March 31, 2013 and 2012:

(in thousands)
 
March 31, 2013
 
March 31, 2012
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Cash and cash equivalents:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
 
$
118,881

 
$
—

 
$
—

 
$
118,881

 
$
147,338

 
$
—

 
$
—

 
$
147,338

Cash equivalents
 
109,895

 
—

 
—

 
109,895

 
61,996

 
2

 
(1
)
 
61,997

Total Cash and cash equivalents
 
$
228,776

 
$
—

 
$
—

 
$
228,776

 
$
209,334

 
$
2

 
$
(1
)
 
$
209,335

Short-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
66,092

 
$
18

 
$
(3
)
 
$
66,107

 
$
61,898

 
$
22

 
$
(24
)
 
$
61,896

Commercial Paper
 
15,670

 
9

 
—

 
15,679

 
20,041

 
1

 
(3
)
 
20,039

Corporate Bonds
 
34,766

 
31

 
(2
)
 
34,795

 
38,300

 
60

 
(4
)
 
38,356

Certificates of Deposit ("CDs")
 
—

 
—

 
—

 
—

 
4,883

 
3

 
—

 
4,886

Total Short-term investments
 
$
116,528

 
$
58

 
$
(5
)
 
$
116,581

 
$
125,122

 
$
86

 
$
(31
)
 
$
125,177

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
55,317

 
$
42

 
$
(1
)
 
$
55,358

 
$
29,814

 
$
24

 
$
(1
)
 
$
29,837

Corporate Bonds
 
23,878

 
23

 
(3
)
 
23,898

 
25,507

 
29

 
(26
)
 
25,510

CDs
 
1,002

 
3

 
—

 
1,005

 
—

 
—

 
—

 
—

Total Long-term investments
 
$
80,197

 
$
68

 
$
(4
)
 
$
80,261

 
$
55,321

 
$
53

 
$
(27
)
 
$
55,347

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents and investments
 
$
425,501

 
$
126

 
$
(9
)
 
$
425,618

 
$
389,777

 
$
141

 
$
(59
)
 
$
389,859



As of March 31, 2013 and 2012, all of the Company's investments are classified as available-for-sale securities. The carrying value of available-for-sale securities included in cash equivalents approximates fair value because of the short maturity of those instruments.

The following table summarizes the amortized cost and fair value of the Company's cash equivalents, short-term investments and long-term investments, classified by stated maturity as of March 31, 2013 and 2012:

(in thousands)
 
March 31, 2013
 
March 31, 2012
 
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in 1 year or less
 
$
226,423

 
$
226,476

 
$
187,118

 
$
187,174

Due in 1 to 3 years
 
80,197

 
80,261

 
55,321

 
55,347

Total
 
$
306,620

 
$
306,737

 
$
242,439

 
$
242,521


The Company did not incur any material realized or unrealized net gains or losses for the fiscal years ended March 31, 2013 and 2012.