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SHARE-BASED COMPENSATION - Schedule of Stock Options (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Options      
Options, Balance (in shares) 519,286 687,963 1,163,908
Options, Granted (in shares) 0 0 0
Options, Exercised (in shares) (86,770) (162,688) (438,338)
Options, Forfeited or canceled (in shares) (15,699) (5,989) (37,607)
Options, Balance (in shares) 416,817 519,286 687,963
Options, Exercisable (in shares) 409,614    
Weighted Average Exercise Price      
Beginning balance (in dollars per share) $ 13.06 $ 12.40 $ 10.84
Granted (in dollars per share) 0 0 0
Exercised (in dollars per share) 10.40 10.12 7.89
Forfeited or canceled (in dollars per share) 14.19 17.71 16.44
Ending balance (in dollars per share) 13.57 13.06 12.40
Exercisable (in dollars per share) 13.59    
Weighted Average Fair Value      
Beginning balance (in dollars per share) 7.33 6.85 5.66
Weighted average fair value, Granted (in dollars per share) 0 0 0
Weighted average fair value, Exercised (in dollars per share) 5.51 5.26 3.45
Weighted average fair value, Forfeited (in dollars per share) 7.40 8.47 7.82
Ending balance (in dollars per share) 7.71 $ 7.33 $ 6.85
Weighted average fair value, exercisable (in dollars per share) $ 7.01    
Weighted Average Remaining Contractual Life (Years)      
Weighted average remaining contractual life (years), Balance 4 years 10 months 2 days    
Weighted average remaining contractual life, exercisable 4 years 9 months 25 days    
Aggregate Intrinsic Value      
Aggregate Intrinsic Value, Outstanding $ 0    
Aggregate Intrinsic Value Exercisable $ 0