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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense Included in Consolidated Statements of Operations
(in thousands)202220212020
Cost of revenue$26,400 $21,822 $20,796 
Selling and marketing46,769 54,182 46,283 
Research and development29,266 25,413 22,885 
General and administrative19,775 14,530 13,104 
$122,210 $115,947 $103,068 
Income tax benefit$(1,881)$(23,410)$(20,464)
Schedule of Compensating Balances
(in thousands)2022
Compensation expense from 2006 ESPP$1,614 
Schedule of Weighted-Average Assumptions Used in Black-Scholes Option Valuation Model
The following table summarizes the Company’s fair value assumptions for stock options:
202220212020
Weighted-average grant-date fair value$17.49 $37.74 $24.16 
Assumptions used in the Black-Scholes option-pricing model:
Expected annual volatility (1)
42 %35 %31 %
Expected term in years (2)
3.94.44.5
Risk-free interest rate (3)
3.4 %0.6 %0.7 %
Expected annual dividend yield (4)
0.1 %0.2 %0.2 %
(1) The expected annual volatility for each grant is determined based on the average of historic daily price changes of the Company’s common stock over a period, which approximates the expected option term.
(2) The expected option term for each grant is determined based on the historical exercise behavior of employees and post-vesting employment termination behavior.
(3) The risk-free interest rate is based on the yield of U.S. Treasury securities with a commensurate maturity with the expected option term at the time of grant.
(4) The expected annual dividend yield is based on the weighted-average dividend yield assumptions used for options granted during the applicable period.
Schedule of Combined Stock Option Activity The following table summarizes the combined stock option activity under the Company’s stock option plans for 2022:
Shares
(in thousands)		Weighted-average Exercise PriceWeighted-average Remaining Contractual Term (in years)Aggregate Intrinsic Value
(in thousands)
Options outstanding as of January 1, 20227,189 $74.94 
Granted9,725 50.35 
Exercised(572)25.17 
Forfeited(1,153)87.71 
Expired(278)$82.83 
Options outstanding as of December 31, 202214,911 $59.67 
Vested and expected to vest as of December 31, 202212,449 $59.06 8.1$9,476 
Exercisable as of December 31, 20223,901 $64.76 5.3$8,056 
Schedule of Combined Restricted Stock Units Activity The following table summarizes the combined RSU activity for all grants, including the CICP, under the 2004 Plan for 2022:
Shares
(in thousands)		Weighted- Average Grant-Date
Fair Value		Aggregate Intrinsic Value
(in thousands)
Nonvested as of January 1, 20222,054 $99.36 
Granted1,571 74.50 
Vested(795)93.72 
Forfeited(479)95.13 
Nonvested as of December 31, 20222,351 $85.52 $80,497 
Expected to vest as of December 31, 20221,716 $85.17 $58,772