UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($)	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Statement Of Changes In Equity [Abstract]
Reserve	$ 339,890,000	$ 280,228,000	$ 400,975,000

A component of equity representing the entity's cumulative undistributed earnings or deficit.

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