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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
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, |
|  | 2018 |  |  | 2017 |
Included in other current liabilities |  | $ | 5,795 |  |  | $ | 5,899 |
Included in other long-term liabilities |  |  | 9,447 |  |  |  | 8,721 |
|  | $ | 15,242 |  |  | $ | 14,620 |
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, |
|  | 2018 |  |  | 2017 |
Included in other non-current assets |  | $ | 1,888 |  |  | $ | 1,826 |
Summary of Equity-based Awards for Employees | Amounts for each category of equity-based award for employees as of December 31, 2018 and changes during the year ended December 31, 2018 were as follows:
|  | Common Stock Awards |  |  | Performance-Based Stock Awards |  |  | Performance-Based Stock Units |
|  | Awards |  |  | Weighted Average Fair Market Value Per Share |  |  | Awards |  |  | Weighted Average Fair Market Value Per Share |  |  | Units |  |  | Weighted Average Fair Market Value Per Share |
Nonvested awards/units at December 31, 2017 |  |  | 202,331 |  |  | $ | 39.09 |  |  |  | 77,254 |  |  | $ | 41.00 |  |  |  | 72,000 |  |  | $ | 52.16 |
Granted |  |  | 65,112 |  |  |  | 57.51 |  |  |  | 52,892 |  |  |  | 65.60 |  |  |  | 14,072 |  |  |  | 55.92 |
Vested |  |  | (91,291 | ) |  |  | 36.14 |  |  |  | — |  |  |  | — |  |  |  | (71,120 | ) |  |  | 52.15 |
Forfeited/Cancelled |  |  | (2,963 | ) |  |  | 49.65 |  |  |  | (14,448 | ) |  |  | 41.00 |  |  |  | (1,704 | ) |  |  | 53.38 |
Nonvested awards/units at December 31, 2018 |  |  | 173,189 |  |  | $ | 47.40 |  |  |  | 115,698 |  |  | $ | 52.25 |  |  |  | 13,248 |  |  | $ | 56.05 |
Summary of Stock Compensation Expenses | During the years ended December 31, 2018, 2017 and 2016, we recorded the following stock compensation expense, by income statement category (in thousands):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Cost of sales |  | $ | 846 |  |  | $ | 965 |  |  | $ | — |
Selling |  |  | 451 |  |  |  | 571 |  |  |  | — |
Administrative |  |  | 6,549 |  |  |  | 5,055 |  |  |  | 1,894 |
|  | $ | 7,846 |  |  | $ | 6,591 |  |  | $ | 1,894 |

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