Derivative Instruments Gain (Loss) (Details) - Interest Rate Swap - Other Nonoperating Income (Expense) [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2015
Derivative [Line Items]
Gain (Loss) on Senior Subordinated Convertible Debentures	$ 5,539	$ 2,897
Gain (Loss) on Interest Rate Swap	$ (6,189)	$ (3,992)