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SHAREHOLDERS' EQUITY - Options Vested and Exercisable or Nonvested that are Expected to Vest (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
5.00 to 10.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 5.00
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 10.00
Options outstanding and Exercisable (in shares) | shares 123,000
Weighted Average Exercise Price (in dollars per share) $ 6.29
Weighted Average Remaining Contractual Life 5 years 6 months 10 days
Aggregate Intrinsic Value (in millions) | $ $ 3.6
10.01 to 15.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 10.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 15.00
Options outstanding and Exercisable (in shares) | shares 0
Weighted Average Exercise Price (in dollars per share) $ 0.00
Weighted Average Remaining Contractual Life 0 years
Aggregate Intrinsic Value (in millions) | $ $ 0.0
15.01 to 20.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 15.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 20.00
Options outstanding and Exercisable (in shares) | shares 57,304
Weighted Average Exercise Price (in dollars per share) $ 17.03
Weighted Average Remaining Contractual Life 2 years 5 months 4 days
Aggregate Intrinsic Value (in millions) | $ $ 1.1
20.01 to 25.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 20.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 25.00
Options outstanding and Exercisable (in shares) | shares 480,720
Weighted Average Exercise Price (in dollars per share) $ 23.55
Weighted Average Remaining Contractual Life 8 years 3 months 18 days
Aggregate Intrinsic Value (in millions) | $ $ 5.9
5.00 to 25.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 5.00
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 25.00
Options outstanding and Exercisable (in shares) | shares 661,024
Weighted Average Exercise Price (in dollars per share) $ 19.78
Weighted Average Remaining Contractual Life 7 years 3 months 7 days
Aggregate Intrinsic Value (in millions) | $ $ 10.6