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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 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):
 September 30, 2021December 31, 2020
Included in other current liabilities$6,775 $7,703 
Included in other long-term liabilities12,490 11,986 
$19,265 $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):
 September 30, 2021December 31, 2020
Included in other non-current assets$2,082 $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 
Granted55,815 124.88 42,449 123.32 8,470 126.89 
Vested(84,254)48.81 (64,525)52.79 (12,952)36.51 
Forfeited/Cancelled(2,448)57.85 — — (488)67.44 
Nonvested awards/units at September 30, 2021200,393 $69.01 144,885 $81.73 8,303 $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 September 30,Nine months ended September 30,
 2021202020212020
Common Stock Awards$1,426 $997 $3,843 $3,006 
Non-Employee Common Stock Awards126 104 339 230 
Performance-Based Stock Awards1,128 928 3,462 2,844 
Liability Performance-Based Stock Awards598 488 1,983 1,554 
Performance-Based Restricted Stock Units257 118 601 416 
$3,535 $2,635 $10,228 $8,050 

We recorded the following stock compensation expense by income statement category (in thousands):
 Three months ended September 30,Nine months ended September 30,
 2021202020212020
Cost of sales$161 $60 $287 $221 
Selling56 45 145 154 
Administrative3,318 2,530 9,796 7,675 
$3,535 $2,635 $10,228 $8,050 
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, 2021
 Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$9,201 1.8 years
Performance-Based Stock Awards6,082 1.7 years
Performance-Based Restricted Stock Units553 0.5 years
Total unrecognized compensation expense related to unvested awards$15,836