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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Costs Related to Company's Stock-Based Compensation Plan The following costs by nature of function related to the Company’s stock-based compensation plan are included in the consolidated statements of income:
 Year ended December 31,
 202120202019
Cost of revenues$7,871 $6,300 $5,895 
General and administrative expenses16,396 11,009 10,012 
Selling and marketing expenses14,354 10,926 10,163 
Total$38,621 $28,235 $26,070 
Income tax benefit related to share-based compensation, including excess tax benefits$9,424 $8,330 $7,986 
Stock Based Compensation Stock Option Activity
Stock option activity under the Company’s stock-based compensation plans is shown below:
Number of OptionsWeighted- Average Exercise PriceAggregate Intrinsic ValueWeighted- Average Remaining Contractual Life (Years)
Outstanding at December 31, 202031,265 $25.43 $1,866 1.9
  Granted— — — — 
  Exercised(28,172)25.19 2,475 — 
  Forfeited— — — — 
Outstanding at December 31, 20213,093 $27.62 $362 2.0
Vested and exercisable at December 31, 20213,093 $27.62 $362 2.0
Year ended December 31,
202120202019
Cash received from options exercised during the year $710 $1,501 $986 
Company's Stock Options Outstanding and Stock Options Vested and Exercisable
The following table summarizes the status of the Company’s stock options outstanding, vested and exercisable at December 31, 2021:
 Options Outstanding, Vested and Exercisable
Range of Exercise PricesSharesWeighted-Average
Exercise Price
$25.01 to $28.00
3,093 $27.62 
Restricted Stock Activity Under Company's Stock Plans
Restricted stock unit activity under the Company’s stock-based compensation plans is shown below:
 Restricted Stock Units
 NumberWeighted-
Average
Fair Value
Outstanding at December 31, 2020**
903,666 $67.84 
  Granted550,690 91.23 
  Vested*(372,519)64.01 
  Forfeited(99,650)75.68 
Outstanding at December 31, 2021**
982,187 $81.61 
* Includes 18,904 and 14,368 restricted stock units vested during the years ended December 31, 2021 and 2020, respectively, for which the underlying common stock is yet to be issued.
** As of December 31, 2021 and 2020, restricted stock units vested for which the underlying common stock is yet to be issued are 162,481 and 181,638, respectively.
The weighted-average fair value of restricted stock units granted was as follows:
Year ended December 31,
202120202019
Weighted-average fair value $91.23 $76.99 $64.29 

The total grant date fair value of restricted stock units vested was as follows:
Year ended December 31,
202120202019
Total grant date fair value$23,845 $20,072 $22,084 
Performance restricted stock unit activity under the Company’s stock plans is shown below:
 Revenue Based PRSUsMarket Condition Based PRSUs
 NumberWeighted Average
Fair Value		NumberWeighted Average
Fair Value
Outstanding at December 31, 2020105,891 $72.33 105,869 $97.84 
Granted— — 121,180 119.80 
Adjustment upon final determination of level of performance goal achievement*(15,134)64.33 45,189 92.13 
Vested(30,062)64.33 (90,378)92.13 
Forfeited(1,831)78.34 (9,818)116.50 
Outstanding at December 31, 202158,864 $78.29 172,042 $113.74 
* Represents adjustment of shares vested in respect of PUs and MUs granted in February 2019 upon achievement of the performance targets for such awards for which the underlying common stock was issued subsequent to December 31, 2021.
Weighted Average Valuation Assumptions for Market Condition Performance Restricted Stock Units
The fair value of each MU granted to employees is estimated on the date of grant using the following weighted average assumptions:
 Year ended December 31,
 202120202019
Dividend yield— — — 
Expected life (years)2.92.92.9
Risk free interest rate for expected life0.53 %3.85 %2.46 %
Volatility for expected life65.24 %34.30 %20.52 %