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Employee Stock Plans (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Awards
Compensation expense for stock-based awards recognized during the three months ended March 31, 2022 and 2021 was as follows (in thousands):
Three Months Ended
March 31,
20222021
Stock options$173 $301 
Restricted stock units and awards1,493 1,381 
Performance share units2,023 1,173 
Total stock-based compensation expense$3,689 $2,855 
Schedule of Stock Options, Restricted Stock Units and Awards, and Performance Share Units Award Activity The following table presents our stock options and restricted stock units and awards activity during the three months ended March 31, 2022 (in thousands, except per share data):
Stock OptionsRestricted Stock Units and Awards
Number of
Options
Weighted Average Exercise Price
Per Share
Number of
Shares
Weighted Average
Grant-Date
Fair Value (1)
Outstanding at beginning of year1,223 $17.71 389 $25.07 
Granted— $— 101 $38.12 
Exercised or released(247)$13.05 (146)$24.04 
Outstanding at March 31, 2022976 $18.89 344 $29.34 
Exercisable at March 31, 2022828 $18.79 

(1)Represents weighted average market value of the shares; awards are granted at no cost to the recipients.
The following table presents our PSU award activity during the three months ended March 31, 2022 (in thousands, except per share data):
Performance
Share Units
Weighted
Average
Grant-Date
Fair Value
Per Unit (1)
Outstanding at beginning of year473 $23.64 
Granted101 $38.12 
Vested(211)$19.82 
Outstanding at March 31, 2022363 $29.89 
(1)Represents weighted average market value of the performance share units; PSUs are granted at no cost to the recipients.