LOSS PER SHARE AND STOCKHOLDERS’ EQUITY: Reconciliation of basic and diluted earnings (loss) per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
EARNINGS (LOSS) PER SHARE AND STOCKHOLDERS' EQUITY [Abstract]
Net loss	$ (23,968)	$ (40,202)	$ (45,696)	$ (82,342)
Basic loss per share
Basic weighted-average shares outstanding (in shares)	66,010	67,684	65,790	68,295
Basic earnings (loss) per share (in USD per share)	$ (0.36)	$ (0.59)	$ (0.69)	$ (1.21)
Diluted earnings (loss) per share:
Basic weighted-average shares outstanding (in shares)	66,010	67,684	65,790	68,295
Dilutive effect of common stock options, warrants, and restricted stock as computed under the treasury stock method (in shares)	0	0	0	0
Diluted weighted-average shares outstanding	66,010	67,684	65,790	68,295
Diluted earnings (loss) per share (in USD per share)	$ (0.36)	$ (0.59)	$ (0.69)	$ (1.21)