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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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, 2017, 2016 and 2015.
| 2017 |  | 2016 |  | 2015
|  |  | Restricted |  |  |  | Restricted |  |  |  | Restricted
Income Statement Classification | Options (1) |  | Shares (2) |  | Options (1) |  | Shares (2) |  | Options (1) |  | Shares (2)
Direct cost of revenues | $ | 370 |  |  | $ | 9,691 |  |  | $ | 2,815 |  |  | $ | 7,530 |  |  | $ | 3,736 |  |  | $ | 6,532 |
Selling, general and administrative expenses | 1,238 |  |  | 4,839 |  |  | 966 |  |  | 9,117 |  |  | 1,482 |  |  | 7,469 |
Special charges | — |  |  | 269 |  |  | 56 |  |  | 49 |  |  | — |  |  | — |
Total | $ | 1,608 |  |  | $ | 14,799 |  |  | $ | 3,837 |  |  | $ | 16,696 |  |  | $ | 5,218 |  |  | $ | 14,001 |
(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 and Grants Using Valuation Assumptions | We use the Black-Scholes option-pricing model to fair value our option grants using the assumptions in the following table.
| Year Ended December 31,
Assumptions | 2017 |  | 2016 |  | 2015
Risk-free interest rate | 1.60% |  | 0.98% |  | 1.07%-1.70%
Dividend yield | 0% |  | 0% |  | 0%
Expected term | 3 years |  | 3 years |  | 3-5 years
Stock price volatility | 31.94% |  | 34.33% |  | 31.03%-40.36%
Schedule of Stock Option Activity | A summary of our stock option activity during the year ended December 31, 2017 is presented below. The aggregate intrinsic value for stock options outstanding and exercisable, or fully vested, at December 31, 2017 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 2017 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, 2017. 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, 2016 | 2,418 |  |  | $ | 40.79 |  |  |  |  |
Stock options granted | 131 |  |  | $ | 40.36 |  |  |  |  |
Stock options exercised | (123 | ) |  | $ | 33.69 |  |  |  |  |
Stock options forfeited | (168 | ) |  | $ | 47.76 |  |  |  |  |
Stock options outstanding at December 31, 2017 | 2,258 |  |  | $ | 40.63 |  |  | 4.4 |  | $ | 11,724 |
Stock options exercisable at December 31, 2017 | 1,683 |  |  | $ | 42.32 |  |  | 3.5 |  | $ | 7,531 |
Schedule of Stock Options Outstanding and Exercisable | The following is a summary of stock options outstanding and exercisable as of December 31, 2017.
| Options Outstanding |  | Options Exercisable
|  |  | Weighted Average Exercise |  | Weighted Average Remaining Contractual Term |  |  |  | Weighted Average Exercise
Exercise Price Range | Options |  | Price |  | (in Years) |  | Shares |  | Price
$26.68-$33.95 | 454 |  |  | $ | 31.60 |  |  | 5.4 |  | 257 |  |  | $ | 31.93 |
$34.33-$36.87 | 526 |  |  | $ | 35.66 |  |  | 6.0 |  | 364 |  |  | $ | 35.84 |
$36.89-$39.84 | 453 |  |  | $ | 38.01 |  |  | 3.5 |  | 409 |  |  | $ | 38.10 |
$40.36-$47.46 | 465 |  |  | $ | 42.66 |  |  | 5.0 |  | 293 |  |  | $ | 43.70 |
$50.62-$70.55 | 360 |  |  | $ | 59.95 |  |  | 0.8 |  | 360 |  |  | $ | 59.95 |
| 2,258 |  |  |  |  |  |  | 1,683 |  |  |
Schedule of Unvested Restricted Share Activity |
| Shares |  | Weighted Average Grant Date Fair Value
Unvested restricted share awards outstanding at December 31, 2016 | 941 |  |  | $ | 37.92 |
Restricted share awards granted | 289 |  |  | $ | 38.45 |
Restricted share awards vested | (251 | ) |  | $ | 36.16 |
Restricted share awards forfeited | (46 | ) |  | $ | 37.55 |
Unvested restricted share awards outstanding at December 31, 2017 | 933 |  |  | $ | 38.58 |
Schedule of Restricted Stock Unit Activity |
| Shares |  | Weighted Average Grant Date Fair Value |  | Intrinsic Value
Restricted stock units outstanding at December 31, 2016 | 465 |  |  | $ | 37.87 |  |  |
Restricted stock units granted | 50 |  |  | $ | 38.35 |  |  |
Restricted stock units released | (113 | ) |  | $ | 39.47 |  |  |
Restricted stock units forfeited | — |  |  | $ | — |  |  |
Restricted stock units outstanding at December 31, 2017 | 402 |  |  | $ | 37.49 |  |  | $ | 17,287 |
Schedule of Performance Stock Units Activity |
| Shares |  | Weighted Average Grant Date Fair Value |  | Intrinsic Value
Performance stock units outstanding at December 31, 2016 | 206 |  |  | $ | 26.64 |  |  |
Performance stock units granted | 100 |  |  | $ | 24.99 |  |  |
Performance stock units released | — |  |  | $ | — |  |  |
Performance stock units forfeited | (54 | ) |  | $ | 33.84 |  |  |
Performance stock units outstanding at December 31, 2017 | 252 |  |  | $ | 25.71 |  |  | $ | 10,818 |
Schedule of Weighted-Average Grant Date Fair Value Per Share of Stock Options, Restricted Share Awards, Restricted Stock Units and Performance Stock Units Awarded | The table below reflects the weighted average grant date fair value per share of stock options, restricted share awards, restricted stock units and performance stock units awarded during the years ended December 31, 2017, 2016 and 2015. The fair value of our restricted stock awards and restricted stock units is determined based on the closing market price per share of our common stock on the grant date. The fair value of the performance stock units reflects the market conditions as of the grant date using a Monte Carlo simulation.
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Weighted average fair value of grants |  |  |  |  |
Stock options | $ | 9.56 |  |  | $ | 8.41 |  |  | $ | 10.85 |
Restricted share awards, restricted stock units and performance stock units | $ | 38.88 |  |  | $ | 37.64 |  |  | $ | 39.01 |

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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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