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Comprehensive Income (Tables)
 3 Months Ended
Dec. 31, 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
 
Nine Months Ended
 
December 31,
 
December 31,
 
2011
 
2010
 
2011
 
2010
Change in unrealized gains and losses on investments, net of tax effect of $97, $1,344, $(332) and $(1,909), respectively.
$
(1,159
)
 
$
984

 
$
(5,113
)
 
$
(258
)