Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
Summary of residual wind-down claims reserve
Balance, April 1, 2012	$ 32,247
Cash paid for Residual Wind-Down Claims	(1,132)
Balance, June 30, 2012	$ 31,115