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Share Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2021
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, 2021 follows:
Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2021204,108 
Granted61,890 
Vested(43,679)
Forfeited(656)
Adjustment for performance conditions of PBRSUs (1)
(2,551)
Nonvested at June 30, 2021 (2)
219,112 
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, 2021:

(In thousands)
Six months ending December 31, 2021$2,418 
20223,987 
20232,574 
20241,064 
2025170 
Total$10,213 
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, 2021 and 2020 follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
2021202020212020
PBRSU and TBRSU vested7,8071,500 43,67938,174
Common shares withheld to satisfy employee income tax withholding obligations2,973530 17,08112,176
Net shares issued4,834 970 26,598 25,998