EARNINGS PER SHARE ("EPS") (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
Computation of Basic (loss) earnings per share:
Net income (loss)	$ 99,280	$ (29,842)	$ 36,432	$ (38,567)	$ 46,399	$ (42,413)	$ 54,735	$ (67,023)	$ 67,303	$ (8,302)	$ (279,470)
Less: net income allocated to participating securities									(1,275)	0	0
Net (loss) income for basic (loss) earnings per share calculation									$ 66,028	$ (8,302)	$ (279,470)
Total weighted average shares outstanding - basic (in shares)									91,921	83,417	80,367
Less: weighted average participating shares outstanding (in shares)									(1,741)	0	0
Weighted average common shares outstanding - basic (in shares)									90,180	83,417	80,367
Basic earnings (loss) per share (in dollars per share)	$ 0.97	$ (0.33)	$ 0.42	$ (0.46)	$ 0.54	$ (0.51)	$ 0.63	$ (0.81)	$ 0.73	$ (0.10)	$ (3.48)
Computation of Diluted (loss) earnings per share:
Net income (loss)	$ 99,280	$ (29,842)	$ 36,432	$ (38,567)	$ 46,399	$ (42,413)	$ 54,735	$ (67,023)	$ 67,303	$ (8,302)	$ (279,470)
Less: net income allocated to participating securities									(1,246)	0	0
Net (loss) income for diluted (loss) earnings per share calculation									$ 66,057	$ (8,302)	$ (279,470)
Total weighted average shares outstanding - basic (in shares)									91,921	83,417	80,367
Add: dilutive effect of common stock equivalents (in shares)									2,152	0	0
Weighted average common shares outstanding—diluted (in shares)									94,073	83,417	80,367
Less: weighted average participating shares outstanding (in shares)									(1,741)	0	0
Weighted average common shares outstanding - diluted (in shares)									92,332	83,417	80,367
Diluted earnings (loss) per share (in dollars per share)	$ 0.89	$ (0.33)	$ 0.39	$ (0.46)	$ 0.48	$ (0.51)	$ 0.55	$ (0.81)	$ 0.72	$ (0.10)	$ (3.48)
Restricted stock
Computation of Diluted (loss) earnings per share:
Antidilutive shares excluded from calculation of EPS										6,405	6,061