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Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2022
Postemployment Benefits [Abstract] |
Summary of Workers' Compensation Known Claims and IBNR Reserves | Workers’ compensation known claims and IBNR reserves included on the Condensed Consolidated Balance Sheets were as follows (in thousands):
| September 30, 2022 |  | December 31, 2021
Included in other current liabilities | $ | 7,373 |  |  | $ | 8,048 |
Included in other long-term liabilities | 15,644 |  |  | 13,397 |
| $ | 23,017 |  |  | $ | 21,445 |
Schedule of Insurance Receivable for Claims | This receivable offsets an equal liability included within the reserve amounts noted above and was as follows (in thousands):
| September 30, 2022 |  | December 31, 2021
Included in other non-current assets | $ | 2,302 |  |  | $ | 2,137 |
Summary of Equity-based Awards for Employees | Amounts and changes for each category of equity-based award were as follows:
| Common Stock Awards |  | Performance-Based Stock Awards |  | Performance-Based Restricted Stock Units
| Awards |  | Weighted Average Grant Date Fair Value Per Share |  | Awards |  | Weighted Average Grant Date Fair Value Per Share |  | Units |  | Weighted Average Grant Date Fair Value Per Share
Nonvested awards/units at December 31, 2021 | 199,353 |  |  | $ | 68.99 |  |  | 143,401 |  |  | $ | 81.30 |  |  | 8,252 |  |  | $ | 126.89 |
Granted | 109,189 |  |  | 89.32 |  |  | 54,585 |  |  | 102.98 |  |  | 16,618 |  |  | 80.55 |
Vested | (147,095) |  |  | 74.77 |  |  | (71,933) |  |  | 59.07 |  |  | (8,061) |  |  | 126.89 |
Forfeited/Cancelled | (1,057) |  |  | 81.61 |  |  | — |  |  | — |  |  | (404) |  |  | 102.46 |
Nonvested awards/units at September 30, 2022 | 160,390 |  |  | $ | 74.44 |  |  | 126,053 |  |  | $ | 103.37 |  |  | 16,405 |  |  | $ | 80.55 |
Summary of Stock Compensation Expenses | The following table summarizes the share-based compensation expense recognized under our 2014 Omnibus Incentive Plan (in thousands):
| Three months ended September 30, |  | Nine months ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Common Stock Awards | $ | 1,420 |  |  | $ | 1,426 |  |  | $ | 4,718 |  |  | $ | 3,843 |
Non-Employee Common Stock Awards | 147 |  |  | 126 |  |  | 396 |  |  | 339 |
Performance-Based Stock Awards | 1,237 |  |  | 1,128 |  |  | 3,863 |  |  | 3,462 |
Liability Performance-Based Stock Awards | 84 |  |  | 598 |  |  | 418 |  |  | 1,983 |
Performance-Based Restricted Stock Units | 324 |  |  | 257 |  |  | 895 |  |  | 601 |
| $ | 3,212 |  |  | $ | 3,535 |  |  | $ | 10,290 |  |  | $ | 10,228 |
We recorded the following stock compensation expense by income statement category (in thousands):
| Three months ended September 30, |  | Nine months ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Cost of sales | $ | 165 |  |  | $ | 161 |  |  | $ | 484 |  |  | $ | 287 |
Selling | 126 |  |  | 56 |  |  | 329 |  |  | 145 |
Administrative | 2,921 |  |  | 3,318 |  |  | 9,477 |  |  | 9,796 |
| $ | 3,212 |  |  | $ | 3,535 |  |  | $ | 10,290 |  |  | $ | 10,228 |
Unrecognized Share-Based Compensation Expense Related to Unvested Awards | Unrecognized share-based compensation expense related to unvested awards was as follows (in thousands):
| As of September 30, 2022
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 7,939 |  |  | 1.8
Performance-Based Stock Awards | 6,591 |  |  | 1.7
Performance-Based Restricted Stock Units | 681 |  |  | 0.5
Total unrecognized compensation expense related to unvested awards | $ | 15,211 |  |  |

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