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Equity Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions Used in Calculation of Fair Value | Below were the assumptions used in the Monte Carlo calculation:
| September 17, 2018 |  | February 8, 2018 |  | February 2, 2017
Expected volatility | 36.6% |  | 34.8% |  | 33.6%
Expected term (in years) | 3.0 |  | 3.0 |  | 3.0
Risk-free interest rate | 2.85% |  | 2.28% |  | 1.38%
Summary of Activity Under Stock Option Plans | The following table summarizes the change in number of stock options outstanding for the nine months ended September 30, 2018:
| Options Outstanding |  | Weighted- Average Exercise Price Per Share |  | Weighted-Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value
Outstanding at December 31, 2017 | 33,283 |  |  | $ | 36.40 |  |  | 2.2 |  | $ | 4,177,655 |
Options exercised | (19,183 | ) |  | $ | 38.26 |  |  |  |  |
Options forfeited | — |  |  | $ | — |  |  |  |  |
Options outstanding, vested and exercisable at September 30, 2018 | 14,100 |  |  | $ | 33.88 |  |  | 2.5 |  | $ | 1,599,534 |
Time Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | The following table summarizes the change in number of time-based restricted stock units outstanding for the nine months ended September 30, 2018:
| Time-Based Restricted Stock Units
Awards outstanding at December 31, 2017 | 173,331 |
Awards granted | 44,610 |
Stock issued | (79,375 | )
Awards forfeited | (16,302 | )
Awards outstanding at September 30, 2018 | 122,264 |
Performance-Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | The following table summarizes the change in number of performance-based restricted stock units outstanding for the nine months ended September 30, 2018:
| Performance-Based Restricted Stock Units
Awards outstanding at December 31, 2017 | 169,202 |
Awards granted | 75,760 |
Stock issued | (81,230 | )
Awards forfeited | (18,599 | )
Awards outstanding at September 30, 2018 | 145,133 |
Deferred Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | The following table summarizes the change in number of deferred stock units outstanding during the nine months ended September 30, 2018:
| Deferred Stock Units
Awards outstanding at December 31, 2017 | 9,250 |
Awards granted | 8,400 |
Stock issued | (9,250 | )
Awards outstanding at September 30, 2018 | 8,400 |

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