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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, 2018
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
Number Exercisable (in shares) | shares 366,043
Weighted Average Exercise Price (in dollars per share) $ 8.54
Weighted Average Remaining Contractual Life 7 years 6 months 7 days
Aggregate Intrinsic Value (in millions) | $ $ 5.5
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
Number Exercisable (in shares) | shares 126,250
Weighted Average Exercise Price (in dollars per share) $ 13.57
Weighted Average Remaining Contractual Life 2 years 18 days
Aggregate Intrinsic Value (in millions) | $ $ 1.3
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
Number Exercisable (in shares) | shares 79,348
Weighted Average Exercise Price (in dollars per share) $ 18.73
Weighted Average Remaining Contractual Life 3 years 2 months 1 day
Aggregate Intrinsic Value (in millions) | $ $ 0.4
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
Number 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
25.01 to 30.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 25.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 30
Number 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
30.01 to 31.66  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 30.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 31.66
Number Exercisable (in shares) | shares 17,550
Weighted Average Exercise Price (in dollars per share) $ 31.66
Weighted Average Remaining Contractual Life 9 years 9 months 7 days
Aggregate Intrinsic Value (in millions) | $ $ 0.0
5.00 to 31.66  
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) $ 31.66
Number Exercisable (in shares) | shares 589,191
Weighted Average Exercise Price (in dollars per share) $ 11.68
Weighted Average Remaining Contractual Life 5 years 9 months 29 days
Aggregate Intrinsic Value (in millions) | $ $ 7.2