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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased 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, 2016, 2015 and 2014.
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  |  |  |  |  | Restricted |  |  |  |  |  |  | Restricted |  |  |  |  |  |  | Restricted |
Income Statement Classification |  | Options(1) |  |  | Shares(2) |  |  | Options(1) |  |  | Shares(2) |  |  | Options(1) |  |  | Shares(2) |
Direct cost of revenues |  | $ | 2,815 |  |  | $ | 7,530 |  |  | $ | 3,736 |  |  | $ | 6,532 |  |  | $ | 5,404 |  |  | $ | 8,951 |
Selling, general and administrative expenses |  |  | 966 |  |  |  | 9,117 |  |  |  | 1,482 |  |  |  | 7,469 |  |  |  | 1,783 |  |  |  | 8,508 |
Special charges(3) |  |  | 56 |  |  |  | 49 |  |  |  | — |  |  |  | — |  |  |  | (126 | ) |  |  | (990 | )
Total |  | $ | 3,837 |  |  | $ | 16,696 |  |  | $ | 5,218 |  |  | $ | 14,001 |  |  | $ | 7,061 |  |  | $ | 16,469 |
(1) | Includes options and cash-settled stock appreciation rights.
(2) | Includes restricted share awards, performance and market condition restricted stock units, and cash-settled restricted stock units.
(3) | Expense acceleration of $0.2 million related to restricted shares and $0.1 million related to options were netted with expense reversal resulting from forfeitures of $1.2 million and $0.2 million, respectively, for the year ended December 31, 2014. There were no forfeitures related to special charges for the year ended December 31, 2016. (See Note 4, “Special Charges” for information related to the special charges).
Schedule of Stock Option and Grants Using Valuation Assumptions | We use the Black-Scholes option-pricing model to value our option grants using the assumptions in the following table.
|  | Year Ended December 31, |
Assumptions |  | 2016 |  |  | 2015 |  |  | 2014 |
Risk-free interest rate |  |  | 0.98% |  |  | 1.07% - 1.70% |  |  | 0.99% - 1.94% |
Dividend yield |  |  | 0% |  |  |  | 0% |  |  |  | 0% |
Expected term |  | 3 years |  |  | 3-5 years |  |  | 3-6 years |
Stock price volatility |  |  | 34.33% |  |  | 31.03% - 40.36% |  |  | 31.05% - 37.60% |
Schedule of Stock Option Activity | The aggregate intrinsic value 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 2016 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, 2016. The aggregate intrinsic value changes based on fluctuations in the fair market value per share of our common stock.
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Average |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | Remaining |  |  |  |  |
|  |  |  |  |  | Average |  |  | Contractual |  |  | Aggregate |
|  |  |  |  |  | Exercise |  |  | Term |  |  | Intrinsic |
|  | Shares |  |  | Price |  |  | (in Years) |  |  | Value |
Stock options outstanding at December 31, 2015 |  |  | 3,349 |  |  | $ | 39.01 |  |  |  |  |  |  |  |  |
Stock options granted |  |  | 119 |  |  | $ | 34.33 |  |  |  |  |  |  |  |  |
Stock options exercised |  |  | (816 | ) |  | $ | 33.30 |  |  |  |  |  |  |  |  |
Stock options forfeited |  |  | (234 | ) |  | $ | 38.17 |  |  |  |  |  |  |  |  |
Stock options outstanding at December 31, 2016 |  |  | 2,418 |  |  | $ | 40.79 |  |  |  | 4.8 |  |  | $ | 16,876 |
Stock options exercisable at December 31, 2016 |  |  | 1,593 |  |  | $ | 43.95 |  |  |  | 3.8 |  |  | $ | 8,290 |
Schedule of Stock Options Outstanding and Exercisable Price Range Status | The following is a summary of stock options outstanding and exercisable as of December 31, 2016.
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Average |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | Remaining |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  | Contractual |  |  |  |  |  |  | Average |
|  |  |  |  |  | Exercise |  |  | Term |  |  |  |  |  |  | Exercise |
Exercise Price Range |  | Shares |  |  | Price |  |  | (in Years) |  |  | Shares |  |  | Price |
$26.68 - $33.95 |  |  | 544 |  |  | $ | 31.51 |  |  |  | 6.2 |  |  |  | 216 |  |  | $ | 32.03 |
$34.33 - $36.87 |  |  | 556 |  |  | $ | 35.66 |  |  |  | 6.9 |  |  |  | 246 |  |  | $ | 35.95 |
$36.89 - $39.54 |  |  | 484 |  |  | $ | 38.01 |  |  |  | 4.4 |  |  |  | 376 |  |  | $ | 38.14 |
$39.84 - $54.30 |  |  | 486 |  |  | $ | 45.13 |  |  |  | 3.6 |  |  |  | 407 |  |  | $ | 45.67 |
$55.63 - $70.55 |  |  | 348 |  |  | $ | 61.28 |  |  |  | 1.6 |  |  |  | 348 |  |  | $ | 61.28 |
|  |  | 2,418 |  |  |  |  |  |  |  |  |  |  |  | 1,593 |  |  |  |  |
Schedule of Unvested Restricted Stock-Based Activity | The fair value of unvested restricted share awards is determined based on the closing market price per share of our common stock on the grant date
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average Grant |
|  |  |  |  |  | Date Fair |
|  | Shares |  |  | Value |
Unvested restricted share awards outstanding at December 31, 2015 |  |  | 783 |  |  | $ | 36.55 |
Restricted share awards granted |  |  | 527 |  |  | $ | 38.37 |
Restricted share awards vested |  |  | (280 | ) |  | $ | 35.67 |
Restricted share awards forfeited |  |  | (89 | ) |  | $ | 35.50 |
Unvested restricted share awards outstanding at December 31, 2016 |  |  | 941 |  |  | $ | 37.92 |
Schedule of Restricted Stock Unit Activity | The fair value of restricted stock units is determined based on the closing market price per share of our common stock on the grant date
|  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Average Grant |  |  |  |  |
|  |  |  |  |  | Date Fair |  |  | Intrinsic |
|  | Shares |  |  | Value |  |  | Value |
Restricted stock units outstanding at December 31, 2015 |  |  | 623 |  |  | $ | 37.53 |  |  |  |  |
Restricted stock units granted |  |  | 66 |  |  | $ | 36.02 |  |  |  |  |
Restricted stock units released |  |  | (221 | ) |  | $ | 36.32 |  |  |  |  |
Restricted stock units forfeited |  |  | (3 | ) |  | $ | 40.46 |  |  |  |  |
Restricted stock units outstanding at December 31, 2016 |  |  | 465 |  |  | $ | 37.87 |  |  | $ | 20,980 |
Schedule of Performance Stock Units Activity | The fair value of performance stock units is determined based on the closing market price per share of our common stock on the grant date.
|  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Average Grant |  |  |  |  |
|  |  |  |  |  | Date Fair |  |  | Intrinsic |
|  | Shares |  |  | Value |  |  | Value |
Performance stock units outstanding at December 31, 2015 |  |  | 135 |  |  | $ | 28.62 |  |  |  |  |
Performance stock units granted |  |  | 84 |  |  | $ | 23.83 |  |  |  |  |
Performance stock units released |  |  | — |  |  | $ | — |  |  |  |  |
Performance stock units forfeited |  |  | (13 | ) |  | $ | 29.11 |  |  |  |  |
Performance stock units outstanding at December 31, 2016 |  |  | 206 |  |  | $ | 26.64 |  |  | $ | 9,276 |
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, 2016, 2015 and 2014.
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Weighted average fair value of grants |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  | $ | 8.41 |  |  | $ | 10.85 |  |  | $ | 10.77 |
Restricted share awards, restricted stock units and performance stock units |  | $ | 37.64 |  |  | $ | 39.01 |  |  | $ | 32.87 |

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