STOCK BASED COMPENSATION - Summary of Stock Awards Exercised (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
STOCK BASED COMPENSATION
Total intrinsic value		$ 0	$ 243
Cash received		0	118
Actual tax benefit realized for tax deductions	$ 0	$ 0	$ 0

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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