Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2012
Summary of residual wind-down claims reserve
Balance, beginning of period	$ 30,973	$ 32,247
Cash paid for Residual Wind-Down Claims	(68)	(1,342)
Balance, December 31, 2012	$ 30,905	$ 30,905