Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Share Based Compensation [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Three Months Ended
	March 31,
	2019		2018
Stock options	$	260	$	252
Nonvested restricted stock awards and restricted stock units		698		775
Employee stock purchase plan		23		22
Director stock ownership plan		31		34
Total share-based compensation expense	$	1,012	$	1,083