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Share-Based Compensation Changes in nonvested shares (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
A summary of changes in the common shares subject to nonvested PBRSUs for the years ended December 31, 2017 and 2016 follows:
 
Common shares subject to PBRSUs
Nonvested at January 1, 2016
44,700

Granted
41,550

Vested
—

Forfeited
(825
)
Nonvested at January 1, 2017
85,425

Granted
45,788

Vested
(9,674
)
Forfeited
(3,021
)
Adjustment for performance conditions of PBRSUs (1)
(1,802
)
Nonvested at December 31, 2017 (2)
116,716