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Employee Benefits (Tables) | 6 Months Ended
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Jun. 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):
| June 30, 2022 |  | December 31, 2021
Included in other current liabilities | $ | 8,271 |  |  | $ | 8,048 |
Included in other long-term liabilities | 13,573 |  |  | 13,397 |
| $ | 21,844 |  |  | $ | 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):
| June 30, 2022 |  | December 31, 2021
Included in other non-current assets | $ | 2,131 |  |  | $ | 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 | 108,219 |  |  | 89.33 |  |  | 54,585 |  |  | 102.98 |  |  | 16,618 |  |  | 80.55 |
Vested | (146,834) |  |  | 74.72 |  |  | (71,933) |  |  | 59.07 |  |  | (8,061) |  |  | 126.89 |
Forfeited/Cancelled | (554) |  |  | 78.13 |  |  | — |  |  | — |  |  | (239) |  |  | 117.58 |
Nonvested awards/units at June 30, 2022 | 160,184 |  |  | $ | 77.45 |  |  | 126,053 |  |  | $ | 103.37 |  |  | 16,570 |  |  | $ | 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 June 30, |  | Six months ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Common Stock Awards | $ | 1,767 |  |  | $ | 1,296 |  |  | $ | 3,298 |  |  | $ | 2,417 |
Non-Employee Common Stock Awards | 125 |  |  | 111 |  |  | 249 |  |  | 213 |
Performance-Based Stock Awards | 1,311 |  |  | 1,187 |  |  | 2,626 |  |  | 2,334 |
Liability Performance-Based Stock Awards | 128 |  |  | 680 |  |  | 334 |  |  | 1,385 |
Performance-Based Restricted Stock Units | 329 |  |  | 224 |  |  | 571 |  |  | 344 |
| $ | 3,660 |  |  | $ | 3,498 |  |  | $ | 7,078 |  |  | $ | 6,693 |
We recorded the following stock compensation expense by income statement category (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Cost of sales | $ | 171 |  |  | $ | 63 |  |  | $ | 319 |  |  | $ | 126 |
Selling | 141 |  |  | 38 |  |  | 203 |  |  | 89 |
Administrative | 3,348 |  |  | 3,397 |  |  | 6,556 |  |  | 6,478 |
| $ | 3,660 |  |  | $ | 3,498 |  |  | $ | 7,078 |  |  | $ | 6,693 |
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, 2022
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 9,395 |  |  | 2.0
Performance-Based Stock Awards | 7,828 |  |  | 1.9
Performance-Based Restricted Stock Units | 1,000 |  |  | 0.8
Total unrecognized compensation expense related to unvested awards | $ | 18,223 |  |  |

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