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Liability for Incurred Losses and Loss Adjustment Expenses Net of Reinsurance Recoverables (Details) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustment of Opening Balance [Line Items]        
Reinsurance recoverable $ 186,533,000 $ 240,824,000    
Property and Casualty Insurance
       
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustment of Opening Balance [Line Items]        
Reinsurance recoverable 176,439,000 223,865,000 167,315,000 162,711,000
Increase in liability for incurred losses and loss adjustment expenses $ 4,800,000