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STOCK-BASED COMPENSATION (Stock Options Activity) (Details) - Employee Stock Option - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2020
Number of Options   
Options outstanding at January 1, 2020 3,322,930
Options granted 147,351
Options modified (198)
Options exercised (592,904)
Options forfeited/cancelled (9,137)
Options outstanding at September 30, 2020 2,868,042
Options vested and exercisable at September 30, 2020 2,489,928
Options expected to vest at September 30, 2020 353,203
Weighted Average Exercise Price   
Options outstanding at January 1, 2020 $ 50.85
Options granted 176.21
Options modified 73.27
Options exercised 38.76
Options forfeited/cancelled 117.40
Options outstanding at September 30, 2020 59.58
Options vested and exercisable at September 30, 2020 46.31
Options expected to vest at September 30, 2020 $ 145.98
Aggregate Intrinsic Value   
Options outstanding at September 30, 2020 $ 756,305
Options vested and exercisable at September 30, 2020 689,630
Options expected to vest at September 30, 2020 $ 62,624
Weighted Average Remaining Contractual Term (in years)  
Options outstanding at September 30, 2020 4 years 6 months
Options vested and exercisable at September 30, 2020 3 years 10 months 24 days
Options expected to vest at September 30, 2020 8 years 4 months 24 days