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Share-based Awards (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of share option activity | The following table summarizes option activity for the six months ended June 30, 2018:
| Options Outstanding Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant Date Fair Value |  |  | Weighted Average Remaining Contractual Life
Outstanding at December 31, 2017 | 1,171,393 |  |  | $ | 56.02 |  |  | $ | 17.15 |  |  |
Granted | 167,557 |  |  | $ | 118.90 |  |  | $ | 36.84 |  |  |
Exercised | (226,888 | ) |  | $ | 45.58 |  |  | $ | 14.59 |  |  |
Forfeited | (6,580 | ) |  | $ | 37.07 |  |  | $ | 12.32 |  |  |
Outstanding at June 30, 2018 | 1,105,482 |  |  | $ | 67.80 |  |  | $ | 20.69 |  |  | 5.08
Exercisable at June 30, 2018 | 562,223 |  |  | $ | 48.81 |  |  | $ | 15.39 |  |  | 3.80
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, 2018:
| Options Outstanding Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant Date Fair Value |
Non-vested outstanding at December 31, 2017 | 694,727 |  |  | $ | 68.06 |  |  | $ | 20.03 |
Granted | 167,557 |  |  | $ | 118.90 |  |  | $ | 36.84 |
Vested | (316,320 | ) |  | $ | 61.76 |  |  | $ | 18.41 |
Forfeited | (2,705 | ) |  | $ | 56.58 |  |  | $ | 16.84 |
Non-vested outstanding at June 30, 2018 | 543,259 |  |  | $ | 87.46 |  |  | $ | 26.17 |
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, 2018 |  |  | June 30, 2017 |
Weighted average grant date fair value | $ | 36.84 |  |  | $ | 25.06 |
Assumptions: |  |  |  |  |
Expected volatility | 30 | % |  | 29 | %
Dividend yield | — | % |  | — | %
Risk-free interest rate | 2.73 | % |  | 1.93 | %
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, 2018:
| 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, 2017 | 511,026 |  |  | $ | 72.07 |  |  | 0.93 |  | 715,970 |  |  | $ | 72.65 |  |  | 1.28
Granted | 71,906 |  |  | $ | 116.02 |  |  |  |  | 158,775 |  |  | $ | 123.27 |  |  |
Shares vested | (215,826 | ) |  | $ | 68.28 |  |  |  |  | (270,362 | ) |  | $ | 67.92 |  |  |
Forfeited | (116,053 | ) |  | $ | 70.89 |  |  |  |  | (34,044 | ) |  | $ | 74.45 |  |  |
Outstanding at June 30, 2018 | 251,053 |  |  | $ | 85.95 |  |  | 1.47 |  | 570,339 |  |  | $ | 88.88 |  |  | 1.70
Schedule of non-cash stock compensation expense | Non-cash stock compensation expense for the three and six months ended June 30, 2018 has been allocated as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2018 |  |  | June 30, 2017 |  |  | June 30, 2018 |  |  | June 30, 2017 |
| (in thousands) |  | (in thousands)
Direct costs | $ | 3,878 |  |  | $ | 5,450 |  |  | $ | 9,053 |  |  | $ | 10,304 |
Selling, general and administrative | 3,160 |  |  | 4,442 |  |  | 7,377 |  |  | 8,397 |
| $ | 7,038 |  |  | $ | 9,892 |  |  | $ | 16,430 |  |  | $ | 18,701 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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