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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-Based Compensation Expense
The table below reflects the total share-based compensation expense recognized in our Consolidated Statements of Comprehensive Income for the years ended December 31, 2021, 2020 and 2019:
 202120202019
Income Statement Classification
Options (1)
Restricted
Shares (2)
Options (1)
Restricted
Shares (2)
Options (1)
Restricted
Shares (2)
Direct cost of revenues$— $13,432 $9 $13,080 $497 $11,869 
Selling, general and administrative expenses2,018 12,130 126 11,926 2,628 9,005 
Total$2,018 $25,562 $135 $25,006 $3,125 $20,874 
(1)Includes options and cash-settled stock appreciation rights.
(2)Includes restricted share awards, restricted stock units, performance stock units and cash-settled restricted stock units.
Schedule of Stock Option Activity
A summary of our stock option activity during the year ended December 31, 2021 is presented in the table below. The aggregate intrinsic value of stock options outstanding and exercisable, or fully vested, at December 31, 2021 represents the total pre-tax intrinsic value, which is calculated as the difference between the closing price of our common stock on the last trading day of 2021 and the exercise price, multiplied by the number of in-the-money options that would have been received by the option holders had all option holders exercised their options on December 31, 2021. The aggregate intrinsic value changes based on fluctuations in the fair market value per share of our common stock.
OptionsWeighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term
(in Years)		Aggregate
Intrinsic
Value
Stock options outstanding at December 31, 2020538 $36.20 
Stock options granted— N/A
Stock options exercised(78)$34.73 
Stock options forfeited— N/A
Stock options outstanding at December 31, 2021460 $36.45 3.5$53,863 
Stock options exercisable at December 31, 2021460 $36.45 3.5$53,863 
Schedule of Unvested Restricted Share Awards Activity
A summary of our restricted share awards activity during the year ended December 31, 2021 is presented below:
SharesWeighted
Average Grant
Date Fair Value
Unvested restricted share awards outstanding at December 31, 2020873 $66.00 
Restricted share awards granted112 $131.59 
Restricted share awards vested(192)$59.45 
Restricted share awards forfeited(11)$79.91 
Unvested restricted share awards outstanding at December 31, 2021782 $76.82 
Schedule of Restricted Stock Unit Activity
A summary of our restricted stock units activity during the year ended December 31, 2021 is presented below:
SharesWeighted
Average Grant
Date Fair Value
Restricted stock units outstanding at December 31, 2020315 $55.45 
Restricted stock units granted38 $129.75 
Restricted stock units released(32)$72.54 
Restricted stock units forfeited— N/A
Restricted stock units outstanding at December 31, 2021321 $62.60 
Schedule of Performance Stock Units Activity
A summary of our performance stock units activity during the year ended December 31, 2021 is presented below:
SharesWeighted
Average Grant
Date Fair Value
Performance stock units outstanding at December 31, 2020370 $87.50 
Performance stock units granted (1)
103 $134.27 
Performance stock units released(157)$63.72 
Performance stock units forfeited (1)
(47)$93.85 
Performance stock units outstanding at December 31, 2021269 $118.27 
(1)    Performance stock units granted and forfeited are presented at the maximum potential payout percentage of 150% of target shares granted.