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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2023
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 June 30,
Six Months Ended June 30,
2023202220232022
Restricted and deferred stock units$4,769 $3,917 $9,194 $9,182 
Performance stock units5,126 2,218 8,081 5,043 
Total stock-based compensation$9,895 $6,135 $17,275 $14,225 
Summary of Unrecognized Compensation Expense As of June 30, 2023, 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$27,578 2026
Performance stock units26,364 2025
Total unrecognized stock-based compensation$53,942 
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 six months ended June 30, 2023 is presented below:
 RSUs and DSUsWeighted-Average Grant-Date Fair Value
Non-vested, beginning of year675,898 $50.27 
Granted309,500 71.12 
Vested(342,563)46.67 
Forfeited(34,072)57.36 
Non-vested, end of period608,763 $62.50 
A summary of the status and activity of stock options for the six months ended June 30, 2023 is presented below:
 Stock OptionsWeighted-
Average
Exercise Price		Weighted-Average Remaining Contractual Term (in years)Aggregate Intrinsic Value (in thousands)
Outstanding, beginning of year15,170 $34.36 
Exercised(13,463)34.36 
Expired(111)34.36 
Outstanding, end of period1,596 $34.36 3.8$56 
Options outstanding and exercisable1,596 $34.36 3.8$56 
Summary of the Status and Activity of PSUs
A summary of the status and activity of non-vested PSUs for the six months ended June 30, 2023 is presented below:
 
PSUs (1)
Weighted-Average Grant-Date Fair Value
Non-vested, beginning of year345,999 $77.42 
Granted233,861 103.39 
Vested(89,901)78.49 
Forfeited(59,726)87.80 
Expired(242)18.26 
Non-vested, end of period429,991 $89.92 
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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 225% (or, for PSUs granted prior to fiscal year 2023, 200%), depending on the level of satisfaction of the performance condition.