Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Calculation of Net Income Per Share

The calculation of net income per share for the three and nine months ended September 30, 2018 and 2017 is reflected in the following table (in thousands, except per share amounts):

	Three Months Ended   September 30,				Nine Months Ended   September 30,
	2018		2017		2018		2017
Net income	$	115,242	$	84,700	$	320,724	$	243,537
Basic:
Weighted average shares	120,115		123,569		121,112		124,567
Diluted:
Weighted average shares	120,115		123,569		121,112		124,567
Dilutive effect of potential common shares	1,328		631		1,081		666
Diluted weighted average shares	121,443		124,200		122,193		125,233
Net income per share:
Basic	$	.96	$	.69	$	2.65	$	1.96
Diluted	$	.95	$	.68	$	2.62	$	1.94