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EQUITY INCENTIVE PLANS (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Awards Available for Grant Under 2016 Plan A summary of awards available for grant under the 2016 Plan is as follows:
Shares Available
for Grant
Balance as of December 31, 20206,505,390 
Additional awards authorized1,450,967 
Awards granted(1,289,567)
Awards forfeited356,999 
Awards withheld for tax purposes135,886 
Balance as of December 31, 20217,159,675 
Additional awards authorized1,476,018 
Awards granted(1,036,109)
Awards forfeited223,053 
Balance as of December 31, 20227,822,637 
Summary of Restricted Stock Units, Activity The fair value of market based PRSUs were estimated at the date of grant using the Monte-Carlo option pricing model. A summary is as follows:
Restricted Stock UnitsPerformance Based Restricted Stock Units and Market-Based Units
Shares
Underlying
RSUs
Weighted
Average
Grant Date
Fair Value
Shares
Underlying
PRSUs 1
Weighted
Average
Grant Date
Fair Value
Balance as of December 31, 2020837,204 $82.82 276,955 $128.54 
Granted1,009,457 88.67 280,110 135.31 
Vested(285,335)78.10 (126,671)165.39 
Forfeited(201,079)104.19 (142,144)127.95 
Balance as of December 31, 20211,360,247 84.99 288,250 119.21 
Granted691,128 147.94 344,981 138.99 
Vested(390,238)85.55 (46,934)257.61 
Forfeited(196,471)110.22 (25,208)109.82 
Balance as of December 31, 20221,464,666 111.16 561,089 120.22 
1Based on the maximum number of performance based restricted stock units in the key executive grant agreements, the actual number of units granted will be based on the annual unit volume CAGR as described below.
Summary of Stock Option Activity Under 2006 and 2016 Plans
The following table summarizes stock option activity:
Options Outstanding
Options
Outstanding
Weighted-
Average
Exercise
Price Per
Share
Weighted-
Average
Remaining
Contractual
Life (years)
Aggregate
Intrinsic
Value
(in thousands)
Balance at December 31, 2020609,881 $40.18 6.24$120,163 
Options exercised(90,939)31.15 
Options forfeited(14,836)68.81 
Balance at December 31, 2021504,106 40.97 5.2038,675 
Options exercised(174,539)36.82 
Options forfeited(1,374)83.15 
Balance at December 31, 2022328,193 43.00 4.4316,635 
Options exercisable – December 31, 2022327,768 42.95 4.4316,631 
Options vested and expected to vest – December 31, 2022328,191 43.00 4.4316,635