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Share Based Compensation Share Based Compensation (Tables)
9 Months Ended
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
A summary of changes in the common shares subject to nonvested PBRSUs for the nine months ended September 30, 2017 follows:

 
Common shares subject to PBRSUs
Nonvested at January 1, 2017
85,425

Granted
45,788

Vested
9,674

Forfeited
150

Adjustment for performance conditions of PBRSUs (1)
(1,802
)
Nonvested at September 30, 2017
119,587

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
The following table details expected additional share-based compensation expense related to PBRSUs currently outstanding:

(In thousands)
 
 
Three months ending December 31, 2017
 
$
711

2018
 
2,509

2019
 
1,867

2020
 
845

2021
 
141

Total
 
$
6,073