CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (88,643)	$ (15,164)
Other comprehensive income (loss):
Unrealized gains (losses) on available for sale securities, net of tax of $0 and $0	161	(52)
Amortization of loss on derivative contract, net of tax of $0 and $0	71	179
Change in other benefit plan minimum liability, net of tax of $0 and $0		70
Total comprehensive loss	$ (88,411)	$ (14,967)