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, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income (loss)	$ (3,616)	$ (24,507)	$ (7,915)	$ 7,669	$ 20,854	$ 17,629	$ 11,233	$ 11,476	$ (28,369)	$ 61,192	$ 49,106
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Denominator for basic net income per share - weighted average common shares outstanding (in shares)									81,927	41,105	41,366
Dilutive common equivalent shares:
Weighted average stock options (in shares)									0	9	54
Weighted average restricted stock units (in shares)									0	523	535
Denominator for diluted net income per share - weighted average shares outstanding (in shares)									81,927	41,637	41,955
Net income (loss) per share:
Basic net income (loss) per share (in dollars per share)									$ (0.35)	$ 1.49	$ 1.19
Diluted net income (loss) per share (in dollars per share)	$ (0.04)	$ (0.25)	$ (0.09)	$ 0.19	$ 0.50	$ 0.42	$ 0.27	$ 0.27	$ (0.35)	$ 1.47	$ 1.17