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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of Share-Based Compensation Expense The following table outlines the compensation expense recorded by type of award (in thousands):
Three Months Ended September 30,
Nine Months Ended September 30,
2022202120222021
Restricted and deferred stock units$5,809 $1,561 $14,991 $4,628 
Performance stock units4,435 728 9,478 1,468 
Total stock-based compensation$10,244 $2,289 $24,469 $6,096 
Summary of Unrecognized Compensation Expense and Vesting Criterion As of September 30, 2022, unrecognized compensation expense related to the awards granted under the LTIP will be amortized through the relevant periods as follows (in thousands):
Unrecognized Compensation ExpenseFinal Year of Recognition
Restricted and deferred stock units$21,047 2025
Performance stock units17,828 2024
Total unrecognized stock-based compensation$38,875 
The total number of PSUs granted under the LTIP was split as follows for the relevant grant years:
202220212020
TSR100 %100 %67 %
ROCE— %— %33 %
Summary of the Status and Activity of Non-Vested RSUs, DSUs, and Options A summary of the status and activity of non-vested RSUs and DSUs for the nine months ended September 30, 2022 is presented below:
 RSUs and DSUsWeighted-Average Grant-Date Fair Value
Non-vested, beginning of year815,062 $42.18 
Granted565,578 51.16 
Vested(628,363)42.38 
Forfeited(56,764)39.31 
Non-vested, end of period695,513 $49.54 
A summary of the status and activity of non-vested stock options for the nine months ended September 30, 2022 is presented below:
 Stock OptionsWeighted-
Average
Exercise Price		Weighted-Average Remaining Contractual Term (in years)Aggregate Intrinsic Value (in thousands)
Outstanding, beginning of year25,549 $34.36 
Exercised(6,934)34.36 
Forfeited(1,218)34.36 
Outstanding, end of period17,397 $34.36 0.8$401 
Options outstanding and exercisable17,397 $34.36 0.8$401 
Summary of the Status and Activity of PSUs
A summary of the status and activity of non-vested PSUs for the nine months ended September 30, 2022 is presented below:
 
PSUs (1)
Weighted-Average Grant-Date Fair Value
Non-vested, beginning of year319,367 $57.58 
Granted282,224 65.65 
Vested(163,406)40.90 
Forfeited(48,892)49.39 
Expired(41,955)22.77 
Non-vested, end of period347,338 $77.35 
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(1)The number of awards assumes that the associated performance condition is met at the target amount (multiplier of one). The final number of shares of the Company’s common stock issued may vary depending on the performance multiplier, which ranges from zero to two, depending on the level of satisfaction of the performance condition.