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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021 |  | December 31, 2020
Included in other current liabilities | $ | 7,591 |  |  | $ | 7,703 |
Included in other long-term liabilities | 11,348 |  |  | 11,986 |
| $ | 18,939 |  |  | $ | 19,689 |
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, 2021 |  | December 31, 2020
Included in other non-current assets | $ | 1,889 |  |  | $ | 1,854 |
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, 2020 | 231,280 |  |  | $ | 48.05 |  |  | 166,961 |  |  | $ | 59.97 |  |  | 13,273 |  |  | $ | 36.51 |
Granted | 48,673 |  |  | 125.75 |  |  | 42,449 |  |  | 123.32 |  |  | 8,470 |  |  | 126.89 |
Vested | (83,403) |  |  | 48.63 |  |  | (64,525) |  |  | 52.79 |  |  | (12,952) |  |  | 36.51 |
Forfeited/Cancelled | (1,092) |  |  | 43.73 |  |  | — |  |  | — |  |  | (443) |  |  | 61.40 |
Nonvested awards/units at June 30, 2021 | 195,458 |  |  | $ | 67.17 |  |  | 144,885 |  |  | $ | 81.73 |  |  | 8,348 |  |  | $ | 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 June 30, |  | Six months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Common Stock Awards | $ | 1,296 |  |  | $ | 1,026 |  |  | $ | 2,417 |  |  | $ | 2,009 |
Non-Employee Common Stock Awards | 111 |  |  | 92 |  |  | 213 |  |  | 125 |
Performance-Based Stock Awards | 1,187 |  |  | 947 |  |  | 2,334 |  |  | 1,916 |
Liability Performance-Based Stock Awards | 680 |  |  | 538 |  |  | 1,385 |  |  | 1,067 |
Performance-Based Restricted Stock Units | 224 |  |  | 130 |  |  | 344 |  |  | 298 |
| $ | 3,498 |  |  | $ | 2,733 |  |  | $ | 6,693 |  |  | $ | 5,415 |
We recorded the following stock compensation expense by income statement category (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cost of sales | $ | 63 |  |  | $ | 65 |  |  | $ | 126 |  |  | $ | 161 |
Selling | 38 |  |  | 59 |  |  | 89 |  |  | 109 |
Administrative | 3,397 |  |  | 2,609 |  |  | 6,478 |  |  | 5,145 |
| $ | 3,498 |  |  | $ | 2,733 |  |  | $ | 6,693 |  |  | $ | 5,415 |
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, 2021
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 10,092 |  |  | 2.0 years
Performance-Based Stock Awards | 7,210 |  |  | 1.9 years
Performance-Based Restricted Stock Units | 800 |  |  | 0.8 years
Total unrecognized compensation expense related to unvested awards | $ | 18,102 |  |  |

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