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SHARE-BASED COMPENSATION (Stock Option Activity) (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation  
Option expiration term 10 years
Options granted to vesting employees vesting per year (as a percent) 25.00%
Option vesting period 4 years
Stock Option Plans Activity and Related Information, Shares  
Outstanding beginning of period, shares | shares 1,388
Granted, shares | shares 251
Exercised, shares | shares (405)
Forfeited, shares | shares (5)
Outstanding end of period, shares | shares 1,229
Expected to vest after applying forfeiture rate, shares | shares 1,210
Vested and exercisable end of period, shares | shares 690
Stock Option Plans Activity and Related Information, Weighted Average Exercise Price  
Outstanding beginning of period, weighted-average exercise price (in dollars per share) | $ / shares $ 28.79
Granted, weighted-average exercise price (in dollars per share) | $ / shares 40.26
Exercised, weighted-average exercise price (in dollars per share) | $ / shares 22.23
Forfeited, weighted-average exercise price (in dollars per share) | $ / shares 37.63
Outstanding end of period, weighted-average exercise price (in dollars per share) | $ / shares 33.25
Expected to vest after applying forfeiture rate, weighted-average exercise price (in dollars per share) | $ / shares 33.15
Vested and exercisable end of period, weighted-average exercise price (in dollars per share) | $ / shares $ 29.42
Summary of Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value  
Outstanding end of period, weighted-average remaining contractual term 6 years 1 month 17 days
Outstanding end of period, aggregate intrinsic value | $ $ 11,870
Expected to vest after applying forfeiture rate, weighted-average remaining contractual term 6 years 1 month 2 days
Expected to vest after applying forfeiture rate, aggregate intrinsic value | $ $ 11,806
Vested and exercisable end of period, weighted-average remaining contractual term 4 years 5 months 19 days
Vested and exercisable end of period, aggregate intrinsic value | $ $ 9,320