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FAIR VALUE MEASUREMENT - Total return swap contracts (Details) - Total return swap contract - shares	Dec. 31, 2019	Dec. 31, 2018
Financial Instruments
Units outstanding	5,695,000
Percent of stock units that were economically hedged	84.40%	89.50%

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- Definition

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.

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- Definition

Number of capital units or capital shares outstanding. This element is relevant to issuers of face-amount certificates and registered investment companies.

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- Definition

The percent of other equity instruments (other than share options) that were economically hedged in a share-based payment arrangement.

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No definition available.

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