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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020, 2019 and 2018:
| 2020 |  | 2019 |  | 2018
|  |  | Restricted |  |  |  | Restricted |  |  |  | Restricted
Income Statement Classification | Options (1) |  | Shares (2) |  | Options (1) |  | Shares (2) |  | Options (1) |  | Shares (2)
Direct cost of revenues | $ | 9 |  |  | $ | 13,080 |  |  | $ | 497 |  |  | $ | 11,869 |  |  | $ | 780 |  |  | $ | 9,804 |
Selling, general and administrative expenses | 126 |  |  | 11,926 |  |  | 2,628 |  |  | 9,005 |  |  | 2,027 |  |  | 8,191 |
Total | $ | 135 |  |  | $ | 25,006 |  |  | $ | 3,125 |  |  | $ | 20,874 |  |  | $ | 2,807 |  |  | $ | 17,995 |
(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, 2020 is presented below. The aggregate intrinsic value of stock options outstanding and exercisable, or fully vested, at December 31, 2020 in the table below 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 2020 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, 2020. The aggregate intrinsic value changes based on fluctuations in the fair market value per share of our common stock.
| Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in Years) |  | Aggregate Intrinsic Value
Stock options outstanding at December 31, 2019 | 678 |  |  | $ | 35.98 |  |  |  |  |
Stock options granted | — |  |  | N/A |  |  |  |
Stock options exercised | (140) |  |  | $ | 35.14 |  |  |  |  |
Stock options forfeited | — |  |  | N/A |  |  |  |
Stock options outstanding at December 31, 2020 | 538 |  |  | $ | 36.20 |  |  | 4.3 |  | $ | 40,065 |
Stock options exercisable at December 31, 2020 | 538 |  |  | $ | 36.20 |  |  | 4.3 |  | $ | 40,065 |
Schedule of Unvested Restricted Share Awards Activity | A summary of our restricted share awards activity during the year ended December 31, 2020 is presented below:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested restricted share awards outstanding at December 31, 2019 | 957 |  |  | $ | 52.86 |
Restricted share awards granted | 165 |  |  | $ | 116.75 |
Restricted share awards vested | (242) |  |  | $ | 48.95 |
Restricted share awards forfeited | (7) |  |  | $ | 56.08 |
Unvested restricted share awards outstanding at December 31, 2020 | 873 |  |  | $ | 66.00 |
Schedule of Restricted Stock Unit Activity | A summary of our restricted stock units activity during the year ended December 31, 2020 is presented below:
| Shares |  | Weighted Average Grant Date Fair Value |  |
Restricted stock units outstanding at December 31, 2019 | 313 |  |  | $ | 43.45 |  |  |
Restricted stock units granted | 57 |  |  | $ | 114.95 |  |  |
Restricted stock units released | (55) |  |  | $ | 48.08 |  |  |
Restricted stock units forfeited | — |  |  | N/A |  |
Restricted stock units outstanding at December 31, 2020 | 315 |  |  | $ | 55.45 |  |  |
Schedule of Performance Stock Units Activity | A summary of our performance stock units activity during the year ended December 31, 2020 is presented below:
| Shares |  | Weighted Average Grant Date Fair Value |  |
Performance stock units outstanding at December 31, 2019 | 361 |  |  | $ | 60.67 |  |  |
Performance stock units granted (1) | 109 |  |  | $ | 130.58 |  |  |
Performance stock units released | (100) |  |  | $ | 37.48 |  |  |
Performance stock units forfeited | — |  |  | N/A |  |
Performance stock units outstanding at December 31, 2020 | 370 |  |  | $ | 87.50 |  |  |
(1) Performance stock units granted are presented at the maximum potential payout percentage of 150% of target shares granted.

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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