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FOREIGN OPERATIONS: (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
FOREIGN OPERATIONS: (Details) - USD ($) $ in Thousands	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
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 105,701	$ 102,217	$ 90,143	$ 82,511	$ 78,316	$ 80,021	$ 64,812	$ 62,471	$ 380,572	$ 285,620	$ 220,101
Long-Lived Assets	405,818				280,835				405,818	280,835
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									354,437	262,135	197,613
Long-Lived Assets	393,564				276,189				393,564	276,189
Group Of Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									26,135	23,485	22,488
Long-Lived Assets	12,254				4,646				12,254	4,646
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									20,789	18,566	18,397
Long-Lived Assets	8,616				757				8,616	757
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									5,346	4,919	$ 4,091
Long-Lived Assets	$ 3,638				$ 3,889				$ 3,638	$ 3,889