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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
Stock-based payment awards  
Schedule of stock-based compensation expense

Year Ended December 31, 

(in thousands)

2023

    

2022

    

2021

Equity award expense

$

12,998

$

11,928

$

11,336

Liability award expense (1)

 

7,910

 

2,569

 

(816)

Total stock-based compensation expense

$

20,908

$

14,497

$

10,520

(1)Liability award benefit for the year ended December 31, 2021, includes a reversal of prior period expense of $2.1 million during the fourth quarter as the result of revised estimates of performance achievement of our 2019 and 2020 cash-settled performance-based restricted stock units.
Schedule of valuation assumptions

Year Ended December 31, 

2023

2022

2021

Remaining performance period as of grant date (in years)

    

2.9

    

2.9

    

2.8

    

Risk-free interest rate used

 

3.9

%  

1.4

%  

0.3

%  

Grant-date fair value

$

15.68

$

11.96

$

14.30

Restricted stock and performance-based restricted stock units  
Stock-based payment awards  
Schedule of restricted stock activity

Weighted

Average

Grant Date

Fair Value

(in thousands, except per share amounts)

    

Shares

    

Per Share

Non-vested restricted stock and performance-based restricted stock units, December 31, 2022

 

2,473

$

9.79

Granted

 

1,486

 

10.28

Vested

 

(1,266)

 

8.89

Canceled

 

(68)

 

9.26

Non-vested restricted stock and performance-based restricted stock units, December 31, 2023

 

2,625

$

10.19

Cash-settled performance units  
Stock-based payment awards  
Schedule of restricted stock activity

Weighted

Average

Grant Date

Fair Value

(in thousands, except per share amounts)

    

Shares

    

Per Share

Non-vested cash-settled performance units, December 31, 2022

 

509

$

9.27

Granted

 

199

 

9.42

Vested

 

 

-

Canceled

 

(160)

 

9.09

Non-vested cash-settled performance units, December 31, 2023

 

548

$

9.37