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Employee Benefits (Tables) | 3 Months Ended
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Mar. 31, 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):
| March 31, 2022 |  | December 31, 2021
Included in other current liabilities | $ | 7,166 |  |  | $ | 8,048 |
Included in other long-term liabilities | 15,509 |  |  | 13,397 |
| $ | 22,675 |  |  | $ | 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):
| March 31, 2022 |  | December 31, 2021
Included in other non-current assets | $ | 2,377 |  |  | $ | 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 | 39,204 |  |  | 102.98 |  |  | 54,585 |  |  | 102.98 |  |  | — |  |  | — |
Forfeited/Cancelled | (50) |  |  | 126.89 |  |  | — |  |  | — |  |  | (191) |  |  | 126.89 |
Nonvested awards/units at March 31, 2022 | 238,507 |  |  | $ | 74.57 |  |  | 197,986 |  |  | $ | 87.28 |  |  | 8,061 |  |  | $ | 126.89 |
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 March 31, |  |
| 2022 |  | 2021 |  |  |  |
Common Stock Awards | $ | 1,531 |  |  | $ | 1,120 |  |  |  |  |
Non-Employee Common Stock Awards | 124 |  |  | 102 |  |  |  |  |
Performance-Based Stock Awards | 1,315 |  |  | 1,148 |  |  |  |  |
Liability Performance-Based Stock Awards | 206 |  |  | 705 |  |  |  |  |
Performance-Based Restricted Stock Units | 242 |  |  | 121 |  |  |  |  |
| $ | 3,418 |  |  | $ | 3,196 |  |  |  |  |
We recorded the following stock compensation expense by income statement category (in thousands):
| Three months ended March 31, |  |
| 2022 |  | 2021 |  |  |  |
Cost of sales | $ | 149 |  |  | $ | 62 |  |  |  |  |
Selling | 62 |  |  | 51 |  |  |  |  |
Administrative | 3,207 |  |  | 3,083 |  |  |  |  |
| $ | 3,418 |  |  | $ | 3,196 |  |  |  |  |
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 March 31, 2022
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 5,910 |  |  | 1.5
Performance-Based Stock Awards | 9,139 |  |  | 2.1
Performance-Based Restricted Stock Units | 50 |  |  | 0.1
Total unrecognized compensation expense related to unvested awards | $ | 15,099 |  |  |

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