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Investments (Tables)
 6 Months Ended
Jun. 30, 2012
Investments [Abstract]  
Schedule of Available-for-sale Securities
The cost, gross unrealized gains, gross unrealized losses, and fair market value of available-for-sale investment securities by major security type and class of security for the periods ended June 30, 2012 and 2011, are as follows:

 
 
Investments
 
(In thousands)
Cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair market value
2012

 
 
 
 
 
 
 
 
 
Federal agency notes
$
24,523

 
 
 
$
(154
)
 
$
24,369

 
Commercial paper
34,329

 
 
 
(745
)
 
33,584

 
Mutual funds
1,374

 
137

 
 
 
1,511

 
Total
$
60,226

 
$
137

 
$
(899
)
 
$
59,464

 
 
 
 
 
 
 
 
 
2011

 
 
 
 
 
 
 
 
 
Federal agency notes
$
117,261

 
 
 
$
(295
)
 
$
116,966

 
Commercial paper
33,754

 
 
 
(841
)
 
32,913

 
Mutual funds
1,090

 
179

 
 
 
1,269

 
Total
$
152,105

 
$
179

 
$
(1,136
)
 
$
151,148