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Marketable Securities (Tables)
12 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable securities, classified as “available-for-sale”
Marketable securities, all of which were classified as “available-for-sale” at March 31, 2015 and 2014, consisted of the following (dollars in thousands):
 
March 31,
 
2015
 
2014
Available-for-sale marketable securities
 
 
 
Amortized cost
$
80,522

 
$
16,868

Gross unrecognized holding losses
(204
)
 

Fair value
$
80,318

 
$
16,868