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Share Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2023
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, 2023 follows:

Common shares subject to PBRSUs
Nonvested at January 1, 2023199,650 
Granted54,698 
Vested(62,815)
Forfeited(1,912)
Adjustment for performance conditions of PBRSUs (1)
— 
Nonvested at June 30, 2023 (2)
189,621 
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, 2023:

(In thousands)
Six months ending December 31, 2023$2,733 
20244,415 
20252,887 
20261,203 
2027193 
Total$11,431 
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 the six months ended June 30, 2023 and 2022 follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
2023202220232022
PBRSUs and TBRSUs vested6,350— 62,81548,415 
Common shares withheld to satisfy employee income tax withholding obligations1,992— 23,97318,658 
Net common shares issued4,358—38,84229,757