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EMPLOYEE STOCK COMPENSATION - Summary of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Granted date fair value of options granted	$ 0	$ 0	$ 1,630
Fair value of options vested	160	611	497
Total intrinsic value of options exercised	96	3,747	722
Cash received from options exercised	$ 0	$ 2,043	$ 0
Weighted-average estimated fair value per share of options granted (in dollars per share)	$ 0.00	$ 0.00	$ 5.09

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Share Based Compensation Arrangement By Share Based Payment Award, Options, Grants In Period, Fair Value

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Amount of cash inflow from exercise of stock options granted under share-based compensation 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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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