INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Mar. 31, 2019 USD ($) reporting_unit	Mar. 31, 2018 USD ($) reporting_unit	Mar. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reporting_unit		1	3
Impairment of goodwill and long-lived assets		$ 0	$ 9,469,000	$ 15,000
Goodwill impairment loss		0	$ 8,036,000	$ 0
Capitalized contract cost, amortization		14,200,000
Capitalized contract cost, impairment loss		$ 0
DXI
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill and long-lived assets	$ 300,000
Intangible asset impairment	1,200,000
Goodwill impairment loss	$ 8,000,000