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Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2021
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, 2021December 31, 2020
Included in other current liabilities$6,876 $7,703 
Included in other long-term liabilities12,618 11,986 
$19,494 $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):
 March 31, 2021December 31, 2020
Included in other non-current assets$1,997 $1,854 
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, 2020
231,280 $48.05 166,961 $59.97 13,273 $36.51 
Granted5,190 123.32 42,449 123.32 — — 
Forfeited/Cancelled(274)36.51 — — (99)36.51 
Nonvested awards/units at March 31, 2021236,196 $49.72 209,410 $72.81 13,174 $36.51 
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,
 20212020
Common Stock Awards$1,120 $982 
Non-Employee Common Stock Awards102 33 
Performance-Based Stock Awards1,148 969 
Liability Performance-Based Stock Awards705 529 
Performance-Based Restricted Stock Units121 168 
$3,196 $2,681 
We recorded the following stock compensation expense by income statement category (in thousands):
 Three months ended March 31,
 20212020
Cost of sales$62 $96 
Selling51 49 
Administrative3,083 2,536 
$3,196 $2,681 
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, 2021
 Unrecognized
Compensation Expense
on Unvested Awards
Weighted Average
Remaining
Vesting Period
Common Stock Awards$6,466 1.7 years
Performance-Based Stock Awards8,397 2.1 years
Performance-Based Restricted Stock Units20 0.1 years
Total unrecognized compensation expense related to unvested awards$14,883