EARNINGS (LOSS) PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Computation of Basic earnings (loss) per share:
Net income (loss)	$ 36,432	$ 54,735	$ (2,135)	$ (12,288)
Less: net income allocated to participating securities	(745)	(2,320)
Net income (loss) for basic earnings (loss) per share calculation	$ 35,687	$ 52,415	$ (2,135)	$ (12,288)
Weighted average common shares outstanding - basic	87,176,000	87,560,000	84,990,000	83,280,000
Less: weighted average participating shares outstanding	(1,783,000)	(3,711,000)
Weighted average common shares outstanding - basic	85,393,000	83,849,000	84,990,000	83,280,000
Basic earnings (loss) per share	$ 0.42	$ 0.63	$ (0.03)	$ (0.15)
Computation of Diluted earnings (loss) per share:
Net income (loss)	$ 36,432	$ 54,735	$ (2,135)	$ (12,288)
Less: Net income allocated to participating securities	(564)	(1,782)
Add: interest expense, net of tax, on Convertible Notes	8,669	7,994
Net income (loss) for diluted EPS calculation	$ 44,537	$ 60,947	$ (2,135)	$ (12,288)
Weighted average common shares outstanding - basic	85,393,000	83,849,000	84,990,000	83,280,000
Add: dilutive effect of common stock equivalents	29,809,000	30,166,000
Weighted average common shares outstanding - diluted	115,202,000	114,015,000	84,990,000	83,280,000
Less: weighted average participating shares outstanding	1,783,000	3,711,000
Total weighted average common shares outstanding - diluted	113,419,000	110,304,000	84,990,000	83,280,000
Diluted earnings (loss) per share (in dollars per share)	$ 0.39	$ 0.55	$ (0.03)	$ (0.15)
Unvested share-based awards excluded from EPS			5,172,000	3,436,000
Restricted stock
Computation of Diluted earnings (loss) per share:
Restricted stock awards, vested (in shares)			2,395,000
Restricted stock awards, issued (in shares)			915,000
Restricted stock awards, canceled (in shares)			59,000