Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Basic and Diluted Shares of Consolidated Condensed Statements of Income

The following summarizes the Common Stock included in the basic and diluted shares, as disclosed on the face of the consolidated condensed statements of income:

	Three MonthsEnded September 30,				Nine MonthsEnded September 30,
	2017		2016		2017		2016
Weighted average number of shares for calculation of basic EPS		36,742,168		36,477,044		36,713,294		36,425,626
Stock options under equity incentive plans		62,908		117,537		117,919		132,737
Weighted average number of shares for calculation of diluted EPS		36,805,076		36,594,581		36,831,213		36,558,363

Common Stock Issuable upon Exercise of Certain Stock Options

The accompanying table represents Common Stock issuable upon the exercise of certain stock options that have been excluded from the diluted earnings calculation because the effect of their inclusion would be anti-dilutive.

	Three MonthsEnded September 30,				Nine MonthsEnded September 30,
	2017		2016		2017		2016
Stock options outstanding for equity incentive plans		1,845,784		1,455,534		1,845,784		1,455,534