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Share Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2022
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 and TBRSUs for the six months ended June 30, 2022 follows:
Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2022211,819 
Granted52,335 
Vested(48,415)
Forfeited(1,913)
Adjustment for performance conditions of PBRSUs (1)
(634)
Nonvested at June 30, 2022 (2)
213,192 
Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block]
The following table details expected additional share-based compensation expense related to PBRSUs and TBRSUs outstanding at June 30, 2022:

(In thousands)
Six months ending December 31, 2022$2,747 
20234,405 
20242,866 
20251,192 
2026191 
Total$11,401 
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 and six months ended June 30, 2022 and 2021 follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
PBRSUs and TBRSUs vested—7,80748,41543,679
Common shares withheld to satisfy employee income tax withholding obligations—2,97318,65817,081
Net common shares issued—4,83429,75726,598