Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2017

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
	March 31, 2017	March 31, 2016
Basic computation	48,385,738	48,242,307
Dilutive effect of:
Performance share awards (1)	117,658	111,534
Diluted computation	48,503,396	48,353,841

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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.