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SHARE-BASED COMPENSATION (Stock Option Activity) (Details) - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation    
Intrinsic value of options exercised $ 2,100 $ 2,000
Total unrecognized compensation cost related to nonvested share-based compensation $ 2,000  
Total unrecognized compensation cost, recognized over a weighted-average period 1 year 11 months 4 days  
Stock Option Plans Activity and Related Information, Shares    
Outstanding beginning of period, shares 1,229  
Granted, shares 190  
Exercised, shares (68)  
Forfeited, shares (2)  
Outstanding end of period, shares 1,349  
Expected to vest after applying forfeiture rate, shares 1,342  
Vested and exercisable end of period, shares 830  
Stock Option Plans Activity and Related Information, Weighted Average Exercise Price    
Outstanding beginning of period, weighted-average exercise price $ 33.25  
Granted, weighted-average exercise price 55.16  
Exercised, weighted-average exercise price 21.99  
Forfeited, weighted-average exercise price 42.77  
Outstanding end of period, weighted-average exercise price 36.89  
Expected to vest after applying forfeiture rate, weighted-average exercise price 36.84  
Vested and exercisable end of period, weighted-average exercise price $ 31.90  
Summary of Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value    
Outstanding at end of period, weighted-average remaining contractual term 6 years 3 months 21 days  
Outstanding at end of period, aggregate intrinsic value $ 15,768  
Expected to vest after applying forfeiture rate, weighted-average remaining contractual term 6 years 3 months 18 days  
Expected to vest after applying forfeiture rate, aggregate intrinsic value $ 15,731  
Vested and exercisable end of period, weighted-average remaining contractual term 4 years 10 months 9 days  
Vested and exercisable end of period, aggregate intrinsic value $ 12,945