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COMMITMENTS AND CONTINGENCIES - Narrative (Details) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 08, 2017 USD ($) | Nov. 02, 2016 patent | Apr. 21, 2016 patent | Dec. 31, 2017 USD ($) claim
Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Pending litigation cases |  |  |  | 0
Siemens Industry, Inc. | Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Patents allegedly infringed | patent |  | 6 | 7 |
Denver Transit Delivery of Train Management System | Threatened Litigation | Subsidiaries |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Alleged damages | $ |  |  |  | $ 0
Denver Transit Installation of Constant Wireless Crossings | Threatened Litigation | Subsidiaries |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Alleged damages | $ | $ 36,800,000 |  |  |
Denver Transit | Threatened Litigation | Subsidiaries |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Claims filed |  |  |  | 0
Asbestos Related Cases | Settled Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Arbitration decisions |  |  |  | 2

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