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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investment Securities
Investment securities consisted of the following (in thousands):
 
 
March 31, 2014
 
December 31, 2013
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
(net
carrying
amount)
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
(net
carrying
amount)
Domestic and foreign corporate bonds
$
214,802

 
$
164

 
$
(76
)
 
$
214,890

 
$
221,418

 
$
140

 
$
(124
)
 
$
221,434

Commercial paper
39,930

 
13

 
(10
)
 
39,933

 
32,941

 
16

 
(3
)
 
32,954

 
$
254,732


$
177


$
(86
)

$
254,823

 
$
254,359

 
$
156

 
$
(127
)
 
$
254,388
Investments by Contractual Maturity
The fair value of these investment securities at March 31, 2014, by contractual maturity, are as follows (in thousands):

 
Fair value
Due in one year or less
$
218,876

Due after one year through two years
35,947

 
$
254,823