Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Summary of residual wind-down claims reserve
Balance, beginning of period	$ 30,855	$ 32,247
Less claims allowed during the period	(1,163)	(1,132)
Balance, end of period	$ 29,692	$ 31,115