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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
20222021
Restricted and deferred stock units$5,265 $1,321 
Performance stock units2,825 291 
Total stock-based compensation$8,090 $1,612 
Summary of Unrecognized Compensation Expense and Vesting Criterion As of March 31, 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$21,532 2025
Performance stock units15,685 2024
Total unrecognized stock-based compensation$37,217 
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 three months ended March 31, 2022 is presented below:
 RSUs and DSUsWeighted-Average Grant-Date Fair Value
Non-vested, beginning of year815,062 $42.18 
Granted388,937 45.92 
Vested(444,556)48.25 
Forfeited(9,745)40.71 
Non-vested, end of year749,698 $40.54 
A summary of the status and activity of non-vested stock options for the three months ended March 31, 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(5,294)34.36 
Forfeited(111)34.36 
Outstanding, end of year20,144 $34.36 5.1$511 
Options outstanding and exercisable20,144 $34.36 5.1$511 
Summary of the Status and Activity of PSUs
A summary of the status and activity of non-vested PSUs for the three months ended March 31, 2022 is presented below:
 
PSUs (1)
Weighted-Average Grant-Date Fair Value
Non-vested, beginning of year319,367 $57.58 
Granted129,676 56.43 
Vested(91,523)32.49 
Expired(41,955)22.77 
Non-vested, end of year315,565 $69.01 
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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.