Earnings Per Share

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Earnings per share

Earnings per share

Our earnings per share (basic and diluted) are presented below (in thousands, except per share amounts):

	Quarter ended June 30,				Six months ended June 30,
	2019		2018		2019		2018
Net income	$	79,955	$	92,512	$	153,934	$	147,699
Weighted average number of common shares outstanding - basic	217,089		216,342		216,900		216,309
Effect of dilutive securities:
Restricted stock units	476		2		327		90
Performance share units	315		—		286		108
Stock options	25		171		42		246
Weighted average number of common shares outstanding - diluted	217,905		216,515		217,555		216,753
Net income per share - basic	$	0.37	$	0.43	$	0.71	$	0.68
Net income per share - diluted	$	0.37	$	0.43	$	0.71	$	0.68

Our calculation of diluted earnings per share includes the impact of the assumed vesting of outstanding restricted stock units, performance share units, and the exercise of outstanding stock options based on the treasury stock method when dilutive. The diluted earnings per share amounts exclude the effects of approximately 2,000 and 36,000 stock awards for the three and six months ended June 30, 2019, respectively, and 431,000 and 259,000 for the three and six months ended June 30, 2018, respectively, as their inclusion would be accretive to earnings per share.