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Share Based Compensation (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2022 follows:
Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2022211,819 
Granted52,335 
Vested(55,464)
Forfeited(3,165)
Adjustment for performance conditions of PBRSUs (1)
(634)
Nonvested at September 30, 2022 (2)
204,891 
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 September 30, 2022:

(In thousands)
Three months ending December 31, 2022$1,392 
20234,487 
20242,939 
20251,228 
2026197 
Total$10,243 
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 nine months ended September 30, 2022 and 2021 follows:

Three Months Ended
September 30,		Nine Months Ended
September 30,
2022202120222021
PBRSUs and TBRSUs vested7,0494,42755,46448,106
Common shares withheld to satisfy employee income tax withholding obligations2,5591,34821,21718,429
Net common shares issued4,4903,07934,24729,677