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Share-based awards (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Share Option Activity | The following table summarizes option activity for the six months ended June 30, 2021:
| Options Outstanding Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Life
Outstanding at December 31, 2020 | 553,746 |  |  | $ | 108.53 |  |  | $ | 31.63 |  |  | 4.86
Granted | 100,299 |  |  | $ | 177.76 |  |  | $ | 49.15 |  |  |
Exercised | (4,020) |  |  | $ | 42.24 |  |  | $ | 14.07 |  |  |
Canceled/expired | — |  |  | $ | — |  |  | $ | — |  |  |
Outstanding at June 30, 2021 | 650,025 |  |  | $ | 119.62 |  |  | $ | 34.44 |  |  | 4.90
Exercisable at June 30, 2021 | 336,942 |  |  | $ | 92.71 |  |  | $ | 27.42 |  |  | 3.63
Schedule of Movement in Non-vested Share Options | The following table summarizes the movement in non-vested share options for the six months ended June 30, 2021:
| Options Outstanding Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Grant Date Fair Value
Non-vested outstanding at December 31, 2020 | 328,901 |  |  | $ | 125.89 |  |  | $ | 36.24 |
Granted | 100,299 |  |  | $ | 177.76 |  |  | $ | 49.15 |
Vested | (116,117) |  |  | $ | 109.53 |  |  | $ | 31.84 |
Forfeited | — |  |  | $ | — |  |  | $ | — |
Non-vested outstanding at June 30, 2021 | 313,083 |  |  | $ | 148.58 |  |  | $ | 42.00 |
Schedule of Weighted Average Fair Values and Assumptions Used | The weighted average grant date fair values and assumptions used were as follows:
| Six Months Ended
| June 30, 2021 |  | June 30, 2020
Weighted average grant date fair value | $ | 49.15 |  |  | $ | 42.43 |
Assumptions: |  |  |
Expected volatility | 30 | % |  | 30 | %
Dividend yield | — | % |  | — | %
Risk-free interest rate | 0.78 | % |  | 0.57 | %
Expected life | 5 years |  | 5 years
Schedule of RSU and PSU Activity | The following table summarizes RSU and PSU activity for the six months ended June 30, 2021:
| PSU Outstanding Number of Shares |  | PSU Weighted Average Grant Date Fair Value |  | PSU Weighted Average Remaining Contractual Life |  | RSU Outstanding Number of Shares |  | RSU Weighted Average Grant Date Fair Value |  | RSU Weighted Average Remaining Contractual Life
Outstanding at December 31, 2020 | 159,641 |  |  | $ | 137.64 |  |  | 1.14 |  | 341,424 |  |  | $ | 145.77 |  |  | 1.41
Granted | 55,444 |  |  | $ | 177.77 |  |  |  |  | 144,274 |  |  | $ | 207.29 |  |  |
Shares vested | (44,132) |  |  | $ | 115.61 |  |  |  |  | (122,331) |  |  | $ | 131.37 |  |  |
Forfeited | (3,159) |  |  | $ | 115.61 |  |  |  |  | (9,818) |  |  | $ | 146.64 |  |  |
Outstanding at June 30, 2021 | 167,794 |  |  | $ | 159.18 |  |  | 1.35 |  | 353,549 |  |  | $ | 175.83 |  |  | 1.87
Schedule of Non-cash Stock Compensation Expense | Non-cash stock compensation expense for the six months ended June 30, 2021 and June 30, 2020 has been allocated as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2021 |  | June 30, 2020 |  | June 30, 2021 |  | June 30, 2020
| (in thousands) |  | (in thousands)
Direct costs | $ | 3,101 |  |  | $ | 2,353 |  |  | $ | 5,156 |  |  | $ | 4,188 |
Selling, general and administrative | 5,379 |  |  | 4,764 |  |  | 9,718 |  |  | 8,998 |
| $ | 8,480 |  |  | $ | 7,117 |  |  | $ | 14,874 |  |  | $ | 13,186 |

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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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