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Employee Benefits (Tables)
 6 Months Ended
Jun. 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):
 June 30, 2022December 31, 2021
Included in other current liabilities$8,271 $8,048 
Included in other long-term liabilities13,573 13,397 
$21,844 $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):
 June 30, 2022December 31, 2021
Included in other non-current assets$2,131 $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 
Granted108,219 89.33 54,585 102.98 16,618 80.55 
Vested(146,834)74.72 (71,933)59.07 (8,061)126.89 
Forfeited/Cancelled(554)78.13 — — (239)117.58 
Nonvested awards/units at June 30, 2022160,184 $77.45 126,053 $103.37 16,570 $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 June 30,Six months ended June 30,
 2022202120222021
Common Stock Awards$1,767 $1,296 $3,298 $2,417 
Non-Employee Common Stock Awards125 111 249 213 
Performance-Based Stock Awards1,311 1,187 2,626 2,334 
Liability Performance-Based Stock Awards128 680 334 1,385 
Performance-Based Restricted Stock Units329 224 571 344 
$3,660 $3,498 $7,078 $6,693 
We recorded the following stock compensation expense by income statement category (in thousands):
 Three months ended June 30,Six months ended June 30,
 2022202120222021
Cost of sales$171 $63 $319 $126 
Selling141 38 203 89 
Administrative3,348 3,397 6,556 6,478 
$3,660 $3,498 $7,078 $6,693 
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, 2022
 Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$9,395 2.0
Performance-Based Stock Awards7,828 1.9
Performance-Based Restricted Stock Units1,000 0.8
Total unrecognized compensation expense related to unvested awards$18,223