Stockholders' Equity (Change in Retained Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			$ 798,370
Net loss	$ 36,377	$ 40,730	(10,950)	$ 3,668
Repurchase of common stock			(69,190)
Balance, end of period	$ 718,230		$ 718,230