SUMMARY OF ACCOUNTING POLICIES - Deferred revenue (Details)	12 Months Ended
Dec. 31, 2018
Streaming Agreement
Disclosure of disaggregation of revenue from contracts with customers [line items]
Initial term of contract	40 years

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

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Balance Type:	na
Period Type:	duration