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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 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):
 March 31, 2022December 31, 2021
Included in other current liabilities$7,166 $8,048 
Included in other long-term liabilities15,509 13,397 
$22,675 $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):
 March 31, 2022December 31, 2021
Included in other non-current assets$2,377 $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 Share		AwardsWeighted
Average Grant
Date Fair Value
Per Share		UnitsWeighted
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 
Granted39,204 102.98 54,585 102.98 — — 
Forfeited/Cancelled(50)126.89 — — (191)126.89 
Nonvested awards/units at March 31, 2022238,507 $74.57 197,986 $87.28 8,061 $126.89 
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 March 31,
 20222021
Common Stock Awards$1,531 $1,120 
Non-Employee Common Stock Awards124 102 
Performance-Based Stock Awards1,315 1,148 
Liability Performance-Based Stock Awards206 705 
Performance-Based Restricted Stock Units242 121 
$3,418 $3,196 
We recorded the following stock compensation expense by income statement category (in thousands):
 Three months ended March 31,
 20222021
Cost of sales$149 $62 
Selling62 51 
Administrative3,207 3,083 
$3,418 $3,196 
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 March 31, 2022
 Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$5,910 1.5
Performance-Based Stock Awards9,139 2.1
Performance-Based Restricted Stock Units50 0.1
Total unrecognized compensation expense related to unvested awards$15,099