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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2022
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):
 September 30, 2022December 31, 2021
Included in other current liabilities$7,373 $8,048 
Included in other long-term liabilities15,644 13,397 
$23,017 $21,445 
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):
 September 30, 2022December 31, 2021
Included in other non-current assets$2,302 $2,137 
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, 2021
199,353 $68.99 143,401 $81.30 8,252 $126.89 
Granted109,189 89.32 54,585 102.98 16,618 80.55 
Vested(147,095)74.77 (71,933)59.07 (8,061)126.89 
Forfeited/Cancelled(1,057)81.61 — — (404)102.46 
Nonvested awards/units at September 30, 2022160,390 $74.44 126,053 $103.37 16,405 $80.55 
Summary of Stock Compensation Expenses
The following table summarizes the share-based compensation expense recognized under our 2014 Omnibus Incentive Plan (in thousands):
 Three months ended September 30,Nine months ended September 30,
 2022202120222021
Common Stock Awards$1,420 $1,426 $4,718 $3,843 
Non-Employee Common Stock Awards147 126 396 339 
Performance-Based Stock Awards1,237 1,128 3,863 3,462 
Liability Performance-Based Stock Awards84 598 418 1,983 
Performance-Based Restricted Stock Units324 257 895 601 
$3,212 $3,535 $10,290 $10,228 
We recorded the following stock compensation expense by income statement category (in thousands):
 Three months ended September 30,Nine months ended September 30,
 2022202120222021
Cost of sales$165 $161 $484 $287 
Selling126 56 329 145 
Administrative2,921 3,318 9,477 9,796 
$3,212 $3,535 $10,290 $10,228 
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 September 30, 2022
 Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$7,939 1.8
Performance-Based Stock Awards6,591 1.7
Performance-Based Restricted Stock Units681 0.5
Total unrecognized compensation expense related to unvested awards$15,211