NET INCOME (LOSS) PER SHARE - Schedule of Calculations of Basic and Diluted Net Income per Share and Potential Common Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net income (loss)	$ 22,310	$ 21,245	$ (1,266)	$ (8,998)	$ (3,616)	$ (24,507)	$ (7,915)	$ 7,669	$ 33,291	$ (28,369)	$ 61,192
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Denominator for basic net income per share - weighted average common shares outstanding (in shares)									92,226	81,927	41,105
Dilutive common equivalent shares:
Weighted average stock options (in shares)									0	0	9
Weighted average restricted stock units (in shares)									694	0	523
Denominator for diluted net income per share - weighted average shares outstanding (in shares)									92,920	81,927	41,637
Net income (loss) per share:
Basic net income (loss) per share (in dollars per share)									$ 0.36	$ (0.35)	$ 1.49
Diluted net income (loss) per share (in dollars per share)	$ 0.24	$ 0.23	$ (0.01)	$ (0.10)	$ (0.04)	$ (0.25)	$ (0.09)	$ 0.19	$ 0.36	$ (0.35)	$ 1.47