ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: - Earnings (Loss) per Share (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
EARNINGS (LOSS) PER SHARE AND STOCKHOLDERS' EQUITY:
Net earnings (loss) from continuing operations									$ 23,480	$ 4,108	$ (8,648)
Earnings from discontinued operations, net of tax									0	0	15,351
Net earnings	$ 5,175	$ 22,941	$ (3,336)	$ (1,300)	$ (8,081)	$ 1,073	$ 7,140	$ 3,976	$ 23,480	$ 4,108	$ 6,703
Basic earnings (loss) per share:
Basic weighted-average shares outstanding									78,891	77,609	77,616
Continuing operations (in dollars per share)									$ 0.30	$ 0.05	$ (0.11)
Discontinued operations (in dollars per share)									0.00	0.00	0.20
Net basic earnings (loss) (in dollars per share)	$ 0.07	$ 0.29	$ (0.04)	$ (0.02)	$ (0.10)	$ 0.01	$ 0.09	$ 0.05	$ 0.30	$ 0.05	$ 0.09
Diluted earnings (loss) per share:
Basic weighted-average shares outstanding									78,891	77,609	77,616
Dilutive effect of common stock options, warrants, and restricted stock as computed under the treasury stock method (in shares)									2,625	2,239	0
Diluted weighted-average shares outstanding									81,516	79,848	77,616
Continuing operations (in dollars per share)									$ 0.29	$ 0.05	$ (0.11)
Discontinued operations (in dollars per share)									0.00	0.00	0.20
Net diluted earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.28	$ (0.04)	$ (0.02)	$ (0.10)	$ 0.01	$ 0.09	$ 0.05	$ 0.29	$ 0.05	$ 0.09
Options, warrants and restricted stock units, first group
Stockholders' Equity
Number of shares outstanding under options, warrants and restricted stock units (in shares)										1,500
Options, warrants and restricted stock units, additional group
Stockholders' Equity
Number of shares outstanding under options, warrants and restricted stock units (in shares)									20	90	1,654
Options, warrants and restricted stock units, additional group | Minimum
Stockholders' Equity
Range of exercise prices for options (in dollars per share)									$ 32.85	$ 27.77	$ 17.49
Options, warrants and restricted stock units, additional group | Maximum
Stockholders' Equity
Range of exercise prices for options (in dollars per share)									$ 32.85	$ 32.85	$ 62.06