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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2018
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, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Included in other current liabilities |  | $ | 6,066 |  |  | $ | 5,899 |
Included in other long-term liabilities |  |  | 8,018 |  |  |  | 8,721 |
|  | $ | 14,084 |  |  | $ | 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):
|  | June 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Included in other non-current assets |  | $ | 1,894 |  |  | $ | 1,826 |
Summary of Equity-based Awards for Employees | Amounts for each category of equity-based award for employees as of December 31, 2017 and changes during the six months ended June 30, 2018 were as follows:
|  |  |  |  |  |  |  | Performance-Based Stock |  |  | Performance-Based Restricted |
|  | Common Stock Awards |  |  | Awards |  |  | Stock Units |
|  |  |  |  | Weighted |  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |
|  |  |  |  | Average Fair |  |  |  |  |  | Average Fair |  |  |  |  |  | Average Fair |
|  |  |  |  | Market Value |  |  |  |  |  | Market Value |  |  |  |  |  | Market Value |
|  | Awards |  |  | Per Share |  |  | Awards |  |  | Per Share |  |  | Units |  |  | 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 |  |  | (90,952 | ) |  |  | 36.10 |  |  |  | — |  |  |  | — |  |  |  | (71,120 | ) |  |  | 52.15 |
Forfeited/Cancelled |  |  | (1,329 | ) |  |  | 44.82 |  |  |  | (14,448 | ) |  |  | 41.00 |  |  |  | (1,464 | ) |  |  | 52.94 |
Nonvested awards/units at June 30, 2018 |  |  | 175,162 |  |  | $ | 47.45 |  |  |  | 115,698 |  |  | $ | 52.25 |  |  |  | 13,488 |  |  | $ | 56.05 |
Summary of Stock Compensation Expenses | During the three and six months ended June 30, 2018 and 2017, we recorded the following stock compensation expense, by income statement category (in thousands):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Cost of sales |  | $ | 180 |  |  | $ | — |  |  | $ | 655 |  |  | $ | — |
Selling |  |  | 89 |  |  |  | — |  |  |  | 372 |  |  |  | — |
Administrative |  |  | 1,687 |  |  |  | 2,090 |  |  |  | 3,169 |  |  |  | 2,570 |
|  | $ | 1,956 |  |  | $ | 2,090 |  |  | $ | 4,196 |  |  | $ | 2,570 |

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