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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement 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,
20212020
Included in other current liabilities$8,048 $7,703 
Included in other long-term liabilities13,39711,986
$21,445 $19,689 
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,
20212020
Included in other non-current assets$2,137 $1,854 
Contributions to Multiemployer Pensions and Health and Welfare Benefit Plans
Our contributions to multiemployer pension and health and welfare benefit plans were as follows (in thousands):
Years ended December 31,
202120202019
Pension plans$2,783 $1,128 $809 
Health & welfare plans2,893952674
Total contributions$5,676 $2,080 $1,483 
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, 2020231,280 $48.05 166,961 $59.97 13,273 $36.51 
Granted55,815 124.88 42,449 123.32 8,470 126.89 
Vested(84,641)48.87 (64,525)52.79 (12,952)36.51 
Forfeited/Cancelled(3,101)62.36 (1,484)123.26 (539)73.06 
Nonvested awards/units at December 31, 2021199,353 $68.99 143,401 $81.30 8,252 $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):

Years ended December 31,
202120202019
Common Stock Awards$5,285 $4,116 $4,242 
Non-Employee Common Stock Awards465 333 359 
Performance-Based Stock Awards4,528 3,869 3,034 
Liability Performance-Based Stock Awards2,612 1,969 432 
Performance-Based Restricted Stock Units862 539 660 
$13,752 $10,826 $8,727 
We recorded the following stock compensation expense, by income statement category (in thousands):

Years ended December 31,
202120202019
Cost of sales$448 $284 $374 
Selling204 202 194 
Administrative13,100 10,340 8,159 
$13,752 $10,826 $8,727 
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 December 31, 2021
Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$7,518 1.7
Performance-Based Stock Awards4,832 1.6
Performance-Based Restricted Stock Units301 0.3
Total unrecognized compensation expense related to unvested awards$12,651