EARNINGS (LOSS) PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Computation of Basic earnings (loss) per share:
Net income ( loss)	$ 54,735	$ (41,369)	$ (12,288)	$ (76,772)
Less: net income allocated to participating securities	(2,320)
Net income (loss) for basic earnings per share calculation	$ 52,415	$ (41,369)	$ (12,288)	$ (76,772)
Total weighted average common shares outstanding - basic	87,560,000	80,355,000	83,280,000	79,862,000
Less: weighted average participating shares outstanding	(3,711,000)
Weighted average common shares outstanding - basic	83,849,000	80,355,000	83,280,000	79,862,000
Basic earnings (loss) per share (in dollars per share)	$ 0.63	$ (0.51)	$ (0.15)	$ (0.96)
Computation of Diluted earnings (loss) per share:
Net loss	$ 54,735	$ (41,369)	$ (12,288)	$ (76,772)
Less: net income allocated to participating securities	(1,782)
Add: interest expense, net of tax, on Convertible Notes	7,994
Net income (loss) for diluted earnings (loss) per share calculation	$ 60,947	$ (41,369)	$ (12,288)	$ (76,772)
Weighted average shares outstanding - basic	83,849,000	80,355,000	83,280,000	79,862,000
Add: dilutive effect of common stock equivalents	30,166,000
Weighted average common shares outstanding - diluted	114,015,000	80,355,000	83,280,000	79,862,000
Less: weighted average participating shares outstanding	(3,711,000)
Weighted average common shares outstanding - diluted	110,304,000	80,355,000	83,280,000	79,862,000
Diluted earnings (loss) per share (in dollars per share)	$ 0.55	$ (0.51)	$ (0.15)	$ (0.96)
Participating securities		6,890,000	3,436,000	6,890,000
Common stock issued in connection with restricted stock awards (in shares)	705,000		1,673,000
Unvested restricted stock awards, canceled (in shares)	32,000		207,000