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Employee Benefits (Tables) | 3 Months Ended
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Mar. 31, 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):
| March 31, 2021 |  | December 31, 2020
Included in other current liabilities | $ | 6,876 |  |  | $ | 7,703 |
Included in other long-term liabilities | 12,618 |  |  | 11,986 |
| $ | 19,494 |  |  | $ | 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):
| March 31, 2021 |  | December 31, 2020
Included in other non-current assets | $ | 1,997 |  |  | $ | 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 | 5,190 |  |  | 123.32 |  |  | 42,449 |  |  | 123.32 |  |  | — |  |  | — |
Forfeited/Cancelled | (274) |  |  | 36.51 |  |  | — |  |  | — |  |  | (99) |  |  | 36.51 |
Nonvested awards/units at March 31, 2021 | 236,196 |  |  | $ | 49.72 |  |  | 209,410 |  |  | $ | 72.81 |  |  | 13,174 |  |  | $ | 36.51 |
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,
| 2021 |  | 2020
Common Stock Awards | $ | 1,120 |  |  | $ | 982 |
Non-Employee Common Stock Awards | 102 |  |  | 33 |
Performance-Based Stock Awards | 1,148 |  |  | 969 |
Liability Performance-Based Stock Awards | 705 |  |  | 529 |
Performance-Based Restricted Stock Units | 121 |  |  | 168 |
| $ | 3,196 |  |  | $ | 2,681 |
We recorded the following stock compensation expense by income statement category (in thousands):
| Three months ended March 31,
| 2021 |  | 2020
Cost of sales | $ | 62 |  |  | $ | 96 |
Selling | 51 |  |  | 49 |
Administrative | 3,083 |  |  | 2,536 |
| $ | 3,196 |  |  | $ | 2,681 |
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, 2021
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 6,466 |  |  | 1.7 years
Performance-Based Stock Awards | 8,397 |  |  | 2.1 years
Performance-Based Restricted Stock Units | 20 |  |  | 0.1 years
Total unrecognized compensation expense related to unvested awards | $ | 14,883 |  |  |

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