Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

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, 2020	June 30, 2019
Basic computation	50,569,725	50,440,685
Dilutive effect of:
Performance share awards (1)	69,280	334,467
Diluted computation	50,639,005	50,775,152

	Six Months Ended
	June 30, 2020	June 30, 2019
Basic computation	50,538,260	50,410,928
Dilutive effect of:
Performance share awards (1)	75,159	333,213
Diluted computation	50,613,419	50,744,141

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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.