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Investments (Tables)
3 Months Ended
Jun. 30, 2013
Investments [Abstract]  
Summary of available-for-sale securities
The following is a summary of available-for-sale and marketable equity securities at June 30, 2013 (amounts in thousands):
 
Available-for-sale Securities
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Government agency bonds
$
692,396

 
$
64

 
$
(6,035
)
 
$
686,425

Municipal bonds
50,069

 
98

 
(593
)
 
49,574

Auction rate securities
33,157

 
1,442

 

 
34,599

Corporate bonds and debt
714,942

 
2,607

 
(2,059
)
 
715,490

Marketable equity securities
5,270

 
661

 

 
5,931

 
$
1,495,834

 
$
4,872

 
$
(8,687
)
 
$
1,492,019

 
The following is a summary of available-for-sale and marketable equity securities at March 31, 2013 (amounts in thousands):
 
Available-for-sale Securities
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Government agency bonds
$
558,116

 
$
335

 
$
(298
)
 
$
558,153

Municipal bonds
25,000

 
146

 
(8
)
 
25,138

Auction rate securities
33,459

 
332

 

 
33,791

Corporate bonds and debt
680,144

 
5,137

 
(159
)
 
685,122

Marketable equity securities
5,270

 
239

 

 
5,509

 
$
1,301,989

 
$
6,189

 
$
(465
)
 
$
1,307,713

Summary of amortized cost and estimated fair value of available-for-sale securities, by maturity
The amortized cost and estimated fair value of the available-for-sale securities at June 30, 2013, by maturity, excluding marketable equity securities of $5.9 million and corporate debt of $6.2 million, which have no contractual maturity, are shown below (amounts in thousands).  Expected maturities can differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties, and the Company views its available-for-sale securities as available for current operations.
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale
 
 
 
 
 
 
 
Due in one year or less
$
336,108

 
$
1,282

 
$
(1
)
 
$
337,389

Due after one year and through five years
1,004,361

 
1,487

 
(5,093
)
 
1,000,755

Due after five years and through ten years
115,880

 
199

 
(3,593
)
 
112,486

Due after ten years
28,025

 
1,243

 

 
29,268

 
$
1,484,374

 
$
4,211

 
$
(8,687
)
 
$
1,479,898