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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-Based Compensation. |
Schedule of share-based compensation expense and related income tax benefit | The following table presents share-based compensation amounts recognized in our Consolidated Statements of Operations, in thousands:
|  | Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Share-based compensation expense |  | $ | 11,317 |  | $ | 9,889 |  | $ | 7,669
Income tax benefit realized from the vesting of awards |  | $ | 3,154 |  | $ | 2,882 |  | $ | 588
Schedule of share-based compensation activity | The following table presents a summary of our share-based compensation activity for the year ended December 31, 2018, in thousands, except per share amounts:
|  | RSAs |  | Stock Options
|  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Weighted Average Exercise Price Per Share |  | Aggregate Intrinsic Value
Balance December 31, 2017 |  | 591.2 |  | $ | 30.92 |  | 683.5 |  | $ | 11.13 |  | $ | 28.97 |  | $ | 31,969.7
Granted |  | 107.3 |  | $ | 85.43 |  | 77.3 |  | $ | 27.44 |  | $ | 74.50 |  |  |
Converted/Exercised |  | (144.8) |  | $ | 26.81 |  | (134.5) |  | $ | 10.91 |  | $ | 28.37 |  | $ | 6,246.7
Forfeited |  | (54.5) |  | $ | 40.74 |  | (14.9) |  | $ | 16.98 |  | $ | 45.46 |  |  |
Balance December 31, 2018 |  | 499.2 |  | $ | 41.29 |  | 611.4 |  | $ | 13.10 |  | $ | 34.45 |  | $ | 8,685.8
Exercisable December 31, 2018 (a) |  |  |  |  | 203.8 |  | $ | 10.65 |  | $ | 27.55 |  | $ | 3,570.9
| (a) |  | The weighted average remaining contractual term for vested stock options is 6.7 years.
Schedule of unrecognized share-based compensation expense relating to unvested awards | We had unrecognized share-based compensation expense relating to unvested awards as shown in the following table, dollars in thousands:
|  | As of December 31, 2018
|  | Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Unrecognized compensation expense related to unvested awards: |  |  |  |  |  |
RSAs |  | $ | 8,589 |  |  | 0.8 years
Stock options |  |  | 2,929 |  |  | 0.8 years
Total unrecognized compensation expense related to unvested awards |  | $ | 11,518 |  |  |
Schedule of the range of payouts and the related expense for RSAs with performance-based conditions | The following table shows the range of payouts and the related expense for our outstanding RSAs with performance-based conditions, in thousands:
|  |  |  |  | Payout Ranges and Related Expense
RSAs with Performance-Based Conditions |  | Grant Date Fair Value |  | 0% |  | 25% |  | 100% |  | 200%
February 22, 2016 |  | $ | 1,899 |  | $ | — |  | $ | 475 |  | $ | 1,899 |  | $ | 3,798
February 21, 2017 |  | $ | 1,962 |  | $ | — |  | $ | 491 |  | $ | 1,962 |  | $ | 3,924
February 19, 2018 |  | $ | 2,247 |  | $ | — |  | $ | 562 |  | $ | 2,247 |  | $ | 4,494
Schedule of key inputs used to estimate the fair value of awards | The following are key inputs in the Monte Carlo analysis for awards granted in 2018 and 2017:
|  | 2018 |  |  | 2017 |
Measurement period (years) |  |  | 2.87 |  |  |  | 2.86 |
Risk free interest rate |  |  | 2.36 | % |  |  | 1.46 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Estimated fair value of market-based RSAs granted |  | $ | 103.31 |  |  | $ | 50.06 |
Schedule of assumptions used to estimate the fair values of options granted |
|  | 2018 |  |  | 2017 |
Risk free interest rate |  |  | 2.78 | % |  |  | 2.18 | %
Expected volatility, using historical return volatility and implied volatility |  |  | 32.50 | % |  |  | 35.00 | %
Expected life (in years) |  |  | 6.0 |  |  |  | 6.0 |
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Estimated fair value of stock options granted |  | $ | 27.44 |  |  | $ | 14.44 |

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