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SHARE-BASED COMPENSATION (Stock Option Activity) (Details) - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation    
Intrinsic value of options exercised $ 3,800 $ 9,400
Total unrecognized compensation cost related to nonvested share-based compensation $ 1,700  
Total unrecognized compensation cost, recognized over a weighted-average period 1 year 8 months 8 days  
Stock Option Plans Activity and Related Information, Shares    
Outstanding beginning of period, shares 1,229  
Granted, shares 190  
Exercised, shares (121)  
Forfeited, shares (2)  
Outstanding end of period, shares 1,296  
Expected to vest after applying forfeiture rate, shares 1,290  
Vested and exercisable end of period, shares 777  
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 19.32  
Forfeited, weighted-average exercise price 42.77  
Outstanding end of period, weighted-average exercise price 37.74  
Expected to vest after applying forfeiture rate, weighted-average exercise price 37.70  
Vested and exercisable end of period, weighted-average exercise price $ 32.99  
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 7 days  
Outstanding at end of period, aggregate intrinsic value $ 14,445  
Expected to vest after applying forfeiture rate, weighted-average remaining contractual term 6 years 3 months 3 days  
Expected to vest after applying forfeiture rate, aggregate intrinsic value $ 14,416  
Vested and exercisable end of period, weighted-average remaining contractual term 4 years 10 months 17 days  
Vested and exercisable end of period, aggregate intrinsic value $ 11,520