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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2019
Postemployment 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, |
|  | 2019 |  |  | 2018 |
Included in other current liabilities |  | $ | 6,777 |  |  | $ | 5,795 |
Included in other long-term liabilities |  |  | 10,874 |  |  |  | 9,447 |
|  | $ | 17,651 |  |  | $ | 15,242 |
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, |
|  | 2019 |  |  | 2018 |
Included in other non-current assets |  | $ | 2,098 |  |  | $ | 1,888 |
Summary of Equity-based Awards for Employees | Amounts for each category of equity-based award for employees as of December 31, 2019 and changes during the year ended December 31, 2019 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, 2018 |  |  | 173,189 |  |  | $ | 47.40 |  |  |  | 115,698 |  |  | $ | 52.25 |  |  |  | 13,248 |  |  | $ | 56.05 |
Granted |  |  | 88,529 |  |  |  | 50.94 |  |  |  | 82,692 |  |  |  | 45.65 |  |  |  | 13,933 |  |  |  | 51.62 |
Vested |  |  | (106,660 | ) |  |  | 42.30 |  |  |  | (31,404 | ) |  |  | 41.00 |  |  |  | (12,808 | ) |  |  | 56.05 |
Forfeited/Cancelled |  |  | (2,176 | ) |  |  | 52.13 |  |  |  | (6,697 | ) |  |  | 65.60 |  |  |  | (1,187 | ) |  |  | 53.26 |
Nonvested awards/units at December 31, 2019 |  |  | 152,882 |  |  | $ | 52.93 |  |  |  | 160,289 |  |  | $ | 50.49 |  |  |  | 13,186 |  |  | $ | 51.62 |
Summary of Stock Compensation Expenses | During the years ended December 31, 2019, 2018 and 2017, we recorded the following stock compensation expense, by income statement category (in thousands):
|  | 2019 |  |  | 2018 |  |  | 2017 |
Cost of sales |  | $ | 374 |  |  | $ | 846 |  |  | $ | 965 |
Selling |  |  | 194 |  |  |  | 451 |  |  |  | 571 |
Administrative |  |  | 8,159 |  |  |  | 6,549 |  |  |  | 5,055 |
|  | $ | 8,727 |  |  | $ | 7,846 |  |  | $ | 6,591 |

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