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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2023
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):
| June 30, 2023 |  | December 31, 2022
Included in other current liabilities | $ | 9,796 |  |  | $ | 9,946 |
Included in other long-term liabilities | 15,312 |  |  | 13,730 |
| $ | 25,108 |  |  | $ | 23,676 |
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):
| June 30, 2023 |  | December 31, 2022
Included in other non-current assets | $ | 2,724 |  |  | $ | 2,318 |
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, 2022 | 157,117 |  |  | $ | 77.31 |  |  | 126,053 |  |  | $ | 103.37 |  |  | 15,711 |  |  | $ | 80.55 |
Granted | 75,928 |  |  | 111.03 |  |  | 69,281 |  |  | 109.09 |  |  | 14,684 |  |  | 111.71 |
Vested | (107,862) |  |  | 71.23 |  |  | (50,994) |  |  | 95.78 |  |  | (15,472) |  |  | 80.55 |
Forfeited/Cancelled | (860) |  |  | 98.41 |  |  | — |  |  | — |  |  | (275) |  |  | 84.62 |
Nonvested awards/units at June 30, 2023 | 124,323 |  |  | $ | 103.03 |  |  | 144,340 |  |  | $ | 108.80 |  |  | 14,648 |  |  | $ | 111.71 |
Summary of Stock Compensation Expenses | The following table summarizes the share-based compensation expense recognized by award type (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Common Stock Awards | $ | 1,511 |  |  | $ | 1,767 |  |  | $ | 2,904 |  |  | $ | 3,298 |
Non-Employee Common Stock Awards | 160 |  |  | 125 |  |  | 308 |  |  | 249 |
Performance-Based Stock Awards | 1,579 |  |  | 1,311 |  |  | 3,142 |  |  | 2,626 |
Liability Performance-Based Stock Awards | 64 |  |  | 128 |  |  | 90 |  |  | 334 |
Performance-Based Restricted Stock Units | 371 |  |  | 329 |  |  | 677 |  |  | 571 |
| $ | 3,685 |  |  | $ | 3,660 |  |  | $ | 7,121 |  |  | $ | 7,078 |
We recorded the following stock compensation expense by income statement category (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Cost of sales | $ | 239 |  |  | $ | 171 |  |  | $ | 405 |  |  | $ | 319 |
Selling | 89 |  |  | 141 |  |  | 225 |  |  | 203 |
Administrative | 3,357 |  |  | 3,348 |  |  | 6,491 |  |  | 6,556 |
| $ | 3,685 |  |  | $ | 3,660 |  |  | $ | 7,121 |  |  | $ | 7,078 |
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 June 30, 2023
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 11,175 |  |  | 2.2 years
Performance-Based Stock Awards | 9,532 |  |  | 1.9 years
Performance-Based Restricted Stock Units | 1,233 |  |  | 0.8 years
Total unrecognized compensation expense related to unvested awards | $ | 21,940 |  |  |

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