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Share Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2022 follows:
Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2022211,819 
Granted52,335 
Vested(48,415)
Forfeited(373)
Adjustment for performance conditions of PBRSUs (1)
(634)
Nonvested at March 31, 2022 (2)
214,732 
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 March 31, 2022:

(In thousands)
Nine months ending December 31, 2022$4,198 
20234,449 
20242,902 
20251,210 
2026194 
Total$12,953 
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 ended March 31, 2022 and 2021 follows:

Three Months Ended
March 31,
20222021
PBRSU and TBRSU vested48,41535,872 
Common shares withheld to satisfy employee income tax withholding obligations18,65814,108 
Net common shares issued29,757 21,764