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Comprehensive Income (Tables)
3 Months Ended
Sep. 30, 2011
Comprehensive Income [Abstract] 
Components of Other Comprehensive Income and Tax Effects [Table Text Block]
The components of other comprehensive income and related tax effects were as follows (amounts in thousands):

 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
 
2011
 
2010
 
2011
 
2010
Change in unrealized gains and losses on investments, net of tax effect of $(547), $1,265, $(428) and $(3,252), respectively.
$
(5,881
)
 
$
6,043

 
$
(3,954
)
 
$
(1,242
)