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SHAREHOLDERS' EQUITY - Weighted-Average Assumptions Used to Estimate Fair Value of Options (Details) - Employee Stock Option
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected annual dividend yield 1.90% 1.40% 2.40%
Risk-free interest rate 2.65% 2.94% 2.26%
Expected volatility 50.40% 48.00% 48.90%
Expected life in years 5 years 5 years 2 months 12 days 4 years