Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

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,
	2018		2017		2018		2017
Weighted average number of shares for calculation of basic EPS		36,103,520		36,742,168		36,364,380		36,713,294
Stock options, restricted stock awards and restricted stock units under equity incentive plans		344,642		62,908		105,379		117,919
Weighted average number of shares for calculation of diluted EPS		36,448,162		36,805,076		36,469,759		36,831,213

Common Stock Issuable upon Exercise of Certain Stock Options

The following 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,
	2018		2017		2018		2017
Stock options under equity incentive plans		12,000		1,845,784		1,359,250		1,845,784