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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2023
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, 2023December 31, 2022
Included in other current liabilities$9,796 $9,946 
Included in other long-term liabilities15,312 13,730 
$25,108 $23,676 
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, 2023December 31, 2022
Included in other non-current assets$2,724 $2,318 
Summary of Equity-based Awards for Employees
Amounts and changes for each category of equity-based award were as follows:
 Common Stock AwardsPerformance-Based Stock AwardsPerformance-Based Restricted Stock Units
 AwardsWeighted Average Grant Date Fair Value Per ShareAwardsWeighted Average Grant Date Fair Value Per ShareUnitsWeighted Average Grant Date Fair Value Per Share
Nonvested awards/units at December 31, 2022
157,117 $77.31 126,053 $103.37 15,711 $80.55 
Granted75,928 111.03 69,281 109.09 14,684 111.71 
Vested(107,862)71.23 (50,994)95.78 (15,472)80.55 
Forfeited/Cancelled(860)98.41 — — (275)84.62 
Nonvested awards/units at June 30, 2023124,323 $103.03 144,340 $108.80 14,648 $111.71 
Summary of Stock Compensation Expenses
The following table summarizes the share-based compensation expense recognized by award type (in thousands):
 Three months ended June 30,Six months ended June 30,
 2023202220232022
Common Stock Awards$1,511 $1,767 $2,904 $3,298 
Non-Employee Common Stock Awards160 125 308 249 
Performance-Based Stock Awards1,579 1,311 3,142 2,626 
Liability Performance-Based Stock Awards64 128 90 334 
Performance-Based Restricted Stock Units371 329 677 571 
$3,685 $3,660 $7,121 $7,078 
We recorded the following stock compensation expense by income statement category (in thousands):
 Three months ended June 30,Six months ended June 30,
 2023202220232022
Cost of sales$239 $171 $405 $319 
Selling89 141 225 203 
Administrative3,357 3,348 6,491 6,556 
$3,685 $3,660 $7,121 $7,078 
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 June 30, 2023
 Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$11,175 2.2 years
Performance-Based Stock Awards9,532 1.9 years
Performance-Based Restricted Stock Units1,233 0.8 years
Total unrecognized compensation expense related to unvested awards$21,940