ACCOUNTING POLICIES - Share-Based Compensation (Details)	12 Months Ended
Dec. 31, 2017
PSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Other equity instruments, threshold trading days	5 days
DSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Other equity instruments, threshold consecutive trading days	5 days

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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration