UNAUDITED SELECTED QUARTERLY FINANCIAL DATA: (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 105,701	$ 102,217	$ 90,143	$ 82,511	$ 78,316	$ 80,021	$ 64,812	$ 62,471	$ 380,572	$ 285,620	$ 220,101
Gross profit	68,849	64,251	48,683	46,085	40,556	45,183	40,346	38,817	227,868	164,902	123,705
Net earnings (loss) from continuing operations	(4,879)	(38,040)	(40,202)	(42,140)	(49,688)	(15,261)	(41,180)	(27,818)	(125,261)	(133,947)	(67,299)
Earnings from discontinued operations, net of tax	750	0	0	0	4,227	1,071,661	61,803	24,803	750	1,162,494	90,779
Net earnings (loss)	$ (4,129)	$ (38,040)	$ (40,202)	$ (42,140)	$ (45,461)	$ 1,056,400	$ 20,623	$ (3,015)	$ (124,511)	$ 1,028,547	$ 23,480
Basic earnings (loss) per share:
Basic earnings (loss) per share from continuing operations (in dollars per share)	$ (0.07)	$ (0.56)	$ (0.59)	$ (0.61)	$ (0.73)	$ (0.20)	$ (0.53)	$ (0.36)	$ (1.85)	$ (1.79)	$ (0.85)
Basic earnings (loss) per share from discontinued operations (in dollars per share)	0.01	0	0	0	0.06	13.85	0.80	0.32	0.01	15.50	1.15
Basic earnings (loss) per share (in USD per share)	(0.06)	(0.56)	(0.59)	(0.61)	(0.67)	13.65	0.27	(0.04)	(1.84)	13.71	0.30
Diluted earnings (loss) per share:
Diluted earnings (loss) per share from continuing operations (in dollars per share)	(0.07)	(0.56)	(0.59)	(0.61)	(0.73)	(0.20)	(0.53)	(0.36)	(1.85)	(1.79)	(0.85)
Diluted earnings (loss) per share from discontinued operations (in dollars per share)	0.01	0	0	0	0.06	13.85	0.80	0.32	0.01	15.50	1.15
Diluted earnings (loss) per share (in USD per share)	$ (0.06)	$ (0.56)	$ (0.59)	$ (0.61)	$ (0.67)	$ 13.65	$ 0.27	$ (0.04)	$ (1.84)	$ 13.71	$ 0.30