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Share Based Compensation (Tables)
6 Months Ended
Jun. 30, 2020
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, 2020 follows:

Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2020194,722  
Granted62,265  
Vested(38,174) 
Forfeited(1,826) 
Adjustment for performance conditions of PBRSUs (1)
(5,399) 
Nonvested at June 30, 2020 (2)
211,588  
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, 2020:

(In thousands)
Six months ending December 31, 2020$2,410  
20213,669  
20222,419  
20231,005  
2024162  
Total$9,665