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Share Based Compensation (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
A summary of changes in the common shares subject to nonvested PBRSUs for the six months ended June 30, 2024 follows:

Common shares subject to PBRSUs
Nonvested at January 1, 2024186,936 
Granted59,165 
Vested(54,981)
Forfeited(1,500)
Adjustment for performance conditions of PBRSUs (1)
— 
Nonvested at June 30, 2024 (2)
189,620 
Share-based Compensation Arrangements by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest
A summary of awards vested during the three months and six months ended June 30, 2024 and 2023 follows:

Three Months Ended
June 30,
Six Months Ended
June 30,
2024202320242023
PBRSUs vested6,350 54,98162,815 
Common shares withheld to satisfy employee income tax withholding obligations1,992 21,93723,973 
Net common shares issued4,35833,04438,842
Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block]
The following table details expected additional share-based compensation expense related to PBRSUs outstanding at June 30, 2024:

(In thousands)
Six months ending December 31, 2024$3,076 
20254,927 
20263,232 
20271,347 
2028217 
Total$12,799