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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Sep. 08, 2017 USD ($)
Denver Transit, Installation of Constant Wireless Crossings | Threatened Litigation | Subsidiaries
Loss Contingencies [Line Items]
Damages alleged	$ 37

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+ References

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
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-Section 50
-Paragraph 1
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-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

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