Corporate Debt (Interest Expense) (Details) - Convertible Senior Subordinated Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Contractual interest coupon	$ 606	$ 776	$ 1,761	$ 2,705
Amortization of discount on liability component and debt issuance costs	542	1,061	1,588	4,322
Interest expense, total	$ 1,148	$ 1,837	$ 3,349	$ 7,027