14 Earnings Per Share

Basic and diluted EPS calculations are detailed as follows (in thousands, except per share data):


	Year Ended December 31, 2018
	Net Income		Weighted-Average Shares		Per Share
	(Numerator)		(Denominator)		Amount
Net income per basic common share	$	593,794		76,992	$	7.71
Effect of dilutive stock option, restricted stock, performance stock unit and restricted stock unit securities		—		626		(0.06	)

Net income per diluted common share	$	593,794		77,618	$	7.65


	Year Ended December 31, 2017
	Net Income		Weighted-Average Shares		Per Share
	(Numerator)		(Denominator)		Amount
Net income per basic common share	$	20,311		79,793	$	0.25
Effect of dilutive stock option, restricted stock, performance stock unit and restricted stock unit securities		—		811		—

Net income per diluted common share	$	20,311		80,604	$	0.25


	Year Ended December 31, 2016
	Net Income		Weighted-Average Shares		Per Share
	(Numerator)		(Denominator)		Amount
Net income per basic common share	$	521,503		80,786	$	6.46
Effect of dilutive stock option, restricted stock, performance stock unit and restricted stock unit securities		—		631		(0.05	)

Net income per diluted common share	$	521,503		81,417	$	6.41

For the years ended December 31, 2018, 2017 and 2016, the Company had 0.1 million, 0.4 million and 0.9 million stock options that were antidilutive, respectively, due to having higher exercise prices than the Company’s average stock price during the period. These securities were not included in the computation of diluted EPS. The effect of dilutive securities was calculated using the treasury stock method.