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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, 2018
Sep. 30, 2017
Share-based Compensation    
Total unrecognized compensation cost related to nonvested share-based compensation $ 1,700  
Total unrecognized compensation cost, recognized over a weighted-average period 2 years 7 months 13 days  
Intrinsic value of options exercised $ 9,400 $ 4,800
Stock Option Plans Activity and Related Information, Shares    
Outstanding beginning of period, shares 1,388  
Granted, shares 251  
Exercised, shares (380)  
Forfeited, shares (5)  
Outstanding end of period, shares 1,254  
Expected to vest after applying forfeiture rate, shares 1,231  
Vested and exercisable end of period, shares 715  
Stock Option Plans Activity and Related Information, Weighted Average Exercise Price    
Outstanding beginning of period, weighted-average exercise price $ 28.79  
Granted, weighted-average exercise price 40.26  
Exercised, weighted-average exercise price 23.00  
Forfeited, weighted-average exercise price 37.63  
Outstanding end of period, weighted-average exercise price 32.80  
Expected to vest after applying forfeiture rate, weighted-average exercise price 32.68  
Vested and exercisable end of period, weighted-average exercise price $ 28.76  
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 $ 18,111  
Expected to vest after applying forfeiture rate, weighted-average remaining contractual term 6 years 2 months 19 days  
Expected to vest after applying forfeiture rate, aggregate intrinsic value $ 17,925  
Vested and exercisable end of period, weighted-average remaining contractual term 4 years 6 months 29 days  
Vested and exercisable end of period, aggregate intrinsic value $ 13,211