EARNINGS (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
	Jun. 30, 2017	Jun. 30, 2016
Basic earnings (loss) per share:
Net earnings (loss)	$ (1,300)	$ 3,976
Basic weighted-average shares outstanding	78,672	77,471
Basic earnings (loss) per share	$ (0.02)	$ 0.05
Diluted earnings (loss) per share:
Dilutive effect of common stock options, warrants, and restricted stock as computed under the treasury stock method	0	1,882
Diluted weighted-average shares outstanding	78,672	79,353
Diluted earnings (loss) per share	$ (0.02)	$ 0.05