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Share Based Compensation (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2021 follows:
Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2021204,108 
Granted61,890 
Vested(48,106)
Forfeited(1,458)
Adjustment for performance conditions of PBRSUs (1)
(2,551)
Nonvested at September 30, 2021 (2)
213,883 
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, 2021:

(In thousands)
Three months ending December 31, 2021$1,204 
20223,971 
20232,563 
20241,059 
2025169 
Total$8,966 
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 nine months ended September 30, 2021 and 2020 follows:

Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
PBRSU and TBRSU vested4,4276,205 48,10644,379
Common shares withheld to satisfy employee income tax withholding obligations1,3481,860 18,42914,036
Net common shares issued3,079 4,345 29,677 30,343