EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Computation of Basic (loss) earnings per share:
Net income (loss)	$ 90,853	$ 25,140	$ (2,736)	$ 60,276	$ 99,280	$ (29,842)	$ 36,432	$ (38,567)	$ 173,533	$ 67,303	$ (8,302)
Less: net income allocated to participating securities									(159)	(1,275)	0
Net (loss) income for basic (loss) earnings per share calculation									$ 173,374	$ 66,028	$ (8,302)
Total weighted average shares outstanding - basic (in shares)									110,210	91,921	83,417
Less: weighted average participating shares outstanding (in shares)									(101)	(1,741)	0
Weighted average common shares outstanding - basic (in shares)									110,109	90,180	83,417
Basic earnings (loss) per share (in dollars per share)	$ 0.80	$ 0.22	$ (0.03)	$ 0.57	$ 0.97	$ (0.33)	$ 0.42	$ (0.46)	$ 1.57	$ 0.73	$ (0.10)
Computation of Diluted (loss) earnings per share:
Net income (loss)	$ 90,853	$ 25,140	$ (2,736)	$ 60,276	$ 99,280	$ (29,842)	$ 36,432	$ (38,567)	$ 173,533	$ 67,303	$ (8,302)
Less: net income allocated to participating securities									(155)	(1,246)	0
Net (loss) income for diluted (loss) earnings per share calculation									$ 173,378	$ 66,057	$ (8,302)
Weighted average common shares outstanding—basic									110,109	91,921	83,417
Total weighted average shares outstanding - basic (in shares)									110,210	91,921	83,417
Add: dilutive effect of common stock equivalents (in shares)									2,755	2,152	0
Weighted average common shares outstanding—diluted (in shares)									112,864	94,073	83,417
Less: weighted average participating shares outstanding (in shares)									(101)	(1,741)	0
Weighted average common shares outstanding - diluted (in shares)									112,763	92,332	83,417
Diluted earnings (loss) per share (in dollars per share)	$ 0.77	$ 0.21	$ (0.03)	$ 0.56	$ 0.89	$ (0.33)	$ 0.39	$ (0.46)	$ 1.54	$ 0.72	$ (0.10)
Restricted stock
Computation of Diluted (loss) earnings per share:
Antidilutive shares excluded from calculation of EPS											6,405