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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Summary of Workers' Compensation Known Claims and IBNR Reserves | Workers’ compensation known claims and IBNR reserves included on the Consolidated Balance Sheets were as follows (in thousands):
| As of December 31,
| 2022 |  | 2021
Included in other current liabilities | $ | 9,946 |  |  | $ | 8,048 |
Included in other long-term liabilities | 13,730 |  |  | 13,397
| $ | 23,676 |  |  | $ | 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):
| As of December 31,
| 2022 |  | 2021
Included in other non-current assets | $ | 2,318 |  |  | $ | 2,137 |
Contributions to Multiemployer Pensions and Health and Welfare Benefit Plans | Our contributions to multiemployer pension and health and welfare benefit plans were as follows (in thousands):
| Years ended December 31,
| 2022 |  | 2021 |  | 2020
Pension plans | $ | 2,916 |  |  | $ | 2,783 |  |  | $ | 1,128 |
Health & welfare plans | 3,115 |  |  | 2,893 |  | 952
Total contributions | $ | 6,031 |  |  | $ | 5,676 |  |  | $ | 2,080 |
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 | (149,504) |  |  | 74.96 |  |  | (71,933) |  |  | 59.07 |  |  | (8,061) |  |  | 126.89 |
Forfeited/Cancelled | (1,921) |  |  | 79.60 |  |  | — |  |  | — |  |  | (1,098) |  |  | 88.61 |
Nonvested awards/units at December 31, 2022 | 157,117 |  |  | $ | 77.31 |  |  | 126,053 |  |  | $ | 103.37 |  |  | 15,711 |  |  | $ | 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):
| Years ended December 31,
| 2022 |  | 2021 |  | 2020
Common Stock Awards | $ | 6,247 |  |  | $ | 5,285 |  |  | $ | 4,116 |
Non-Employee Common Stock Awards | 547 |  |  | 465 |  |  | 333 |
Performance-Based Stock Awards | 5,337 |  |  | 4,528 |  |  | 3,869 |
Liability Performance-Based Stock Awards | 493 |  |  | 2,612 |  |  | 1,969 |
Performance-Based Restricted Stock Units | 1,192 |  |  | 862 |  |  | 539 |
| $ | 13,816 |  |  | $ | 13,752 |  |  | $ | 10,826 |
We recorded the following stock compensation expense, by income statement category (in thousands):
| Years ended December 31,
| 2022 |  | 2021 |  | 2020
Cost of sales | $ | 648 |  |  | $ | 448 |  |  | $ | 284 |
Selling | 478 |  |  | 204 |  |  | 202 |
Administrative | 12,690 |  |  | 13,100 |  |  | 10,340 |
| $ | 13,816 |  |  | $ | 13,752 |  |  | $ | 10,826 |
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 December 31, 2022
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 6,259 |  |  | 1.7
Performance-Based Stock Awards | 5,825 |  |  | 1.6
Performance-Based Restricted Stock Units | 348 |  |  | 0.3
Total unrecognized compensation expense related to unvested awards | $ | 12,432 |  |  |

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