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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
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, |
|  | 2017 |  |  | 2016 |
Included in other current liabilities |  | $ | 5,899 |  |  | $ | 4,595 |
Included in other long-term liabilities |  |  | 8,721 |  |  |  | 7,052 |
|  | $ | 14,620 |  |  | $ | 11,647 |
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, |
|  | 2017 |  |  | 2016 |
Included in other non-current assets |  | $ | 1,826 |  |  | $ | 1,249 |
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 twelve months ended December 31, 2017 were as follows:
|  | Common Stock Awards |  |  | Performance-Based Stock Awards |  |  | Performance-Based Restricted 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, 2016 |  |  | 161,174 |  |  | $ | 26.36 |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Granted |  |  | 101,241 |  |  |  | 52.00 |  |  |  | 77,254 |  |  |  | 41.00 |  |  |  | 74,818 |  |  |  | 52.16 |
Vested |  |  | (58,302 | ) |  |  | 26.43 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited/Cancelled |  |  | (1,782 | ) |  |  | 35.07 |  |  |  | — |  |  |  | — |  |  |  | (2,818 | ) |  |  | 52.00 |
Nonvested awards/units at December 31, 2017 |  |  | 202,331 |  |  | $ | 39.09 |  |  |  | 77,254 |  |  | $ | 41.00 |  |  |  | 72,000 |  |  | $ | 52.16 |
Summary of Stock Compensation Expenses | During the twelve months ended December 31, 2017 and 2016, we recorded the following stock compensation expense, by income statement category (in thousands):
|  | 2017 |  |  | 2016 |
Cost of sales |  | $ | 965 |  |  | $ | — |
Selling |  |  | 571 |  |  |  | — |
Administrative |  |  | 5,055 |  |  |  | 1,894 |
|  | $ | 6,591 |  |  | $ | 1,894 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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