Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

Average shares used in computing the basic and diluted earnings per share are as follows:

	Three Months Ended
	June 30, 2019	June 30, 2018
Basic computation	50,440,685	49,869,176
Dilutive effect of:
Performance share awards (1)	334,467	175,369
Diluted computation	50,775,152	50,044,545

	Six Months Ended
	June 30, 2019	June 30, 2018
Basic computation	50,410,928	49,643,954
Dilutive effect of:
Performance share awards (1)	333,213	173,840
Diluted computation	50,744,141	49,817,794

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(1)          Performance share awards are included in diluted weighted average number of shares outstanding based upon what would be issued if the end of the most recent reporting period was the end of the term of the award.