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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 |  |  |

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