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CASH, CASH EQUIVALENTS, AND INVESTMENTS
 6 Months Ended
Sep. 30, 2013
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]  
Cash, Cash Equivalents, and Investments [Text Block]
CASH, CASH EQUIVALENTS, AND INVESTMENTS

The following table represents the Company’s cash, cash equivalents, and investments as of September 30, 2013 and March 31, 2013:

(in thousands)
 
September 30, 2013
 
March 31, 2013
 
 
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
 
$
236,372

 
$
—

 
$
—

 
$
236,372

 
$
118,881

 
$
—

 
$
—

 
$
118,881

Cash equivalents
 
9,607

 
1

 
—

 
9,608

 
109,895

 
—

 
—

 
109,895

Total cash and cash equivalents
 
$
245,979

 
$
1

 
$
—

 
$
245,980

 
$
228,776

 
$
—

 
$
—

 
$
228,776

 
 


 


 


 


 


 


 


 


Short-term investments:
 


 


 


 


 


 


 


 


U.S. Treasury Bills and Government Agency Securities
 
$
56,964

 
$
33

 
$
(15
)
 
$
56,982

 
$
66,092

 
$
18

 
$
(3
)
 
$
66,107

Commercial paper
 
30,835

 
12

 
(1
)
 
30,846

 
15,670

 
9

 
—

 
15,679

Corporate bonds
 
24,294

 
19

 
(1
)
 
24,312

 
34,766

 
31

 
(2
)
 
34,795

Certificates of deposit ("CDs")
 
1,002

 
1

 
—

 
1,003

 
—

 
—

 
—

 
—

Total short-term investments
 
$
113,095

 
$
65

 
$
(17
)
 
$
113,143

 
$
116,528

 
$
58

 
$
(5
)
 
$
116,581

 
 


 


 


 


 


 


 


 


Long-term investments:
 


 


 


 


 


 


 


 


U.S. Treasury Bills and Government Agency Securities
 
$
15,473

 
$
18

 
$
(4
)
 
$
15,487

 
$
55,317

 
$
42

 
$
(1
)
 
$
55,358

Corporate bonds
 
63,926

 
85

 
(23
)
 
63,988

 
23,878

 
23

 
(3
)
 
23,898

 CDs
 
—

 
—

 
—

 
—

 
1,002

 
3

 
—

 
1,005

Total long-term investments
 
$
79,399

 
$
103

 
$
(27
)
 
$
79,475

 
$
80,197

 
$
68

 
$
(4
)
 
$
80,261

 
 

 

 

 

 

 

 

 

Total cash, cash equivalents and investments
 
$
438,473

 
$
169

 
$
(44
)
 
$
438,598

 
$
425,501

 
$
126

 
$
(9
)
 
$
425,618



As of September 30, 2013 and March 31, 2013, 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 September 30, 2013 and March 31, 2013:

(in thousands)
 
September 30, 2013
 
March 31, 2013
 
 
Amortized
Cost
 
Fair Value
 
Amortized
Cost
 
Fair Value
Due in 1 year or less
 
$
122,702


$
122,751

 
$
226,423


$
226,476

Due in 1 to 3 years
 
79,399


79,475

 
80,197


80,261

Total
 
$
202,101


$
202,226

 
$
306,620


$
306,737



The Company did not incur any material realized or unrealized net gains or losses in the three and six months ended September 30, 2013 and 2012.