Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Calculation of Net Income Per Share

The calculation of net income per share for the three and six months ended June 30, 2017 and 2016 is reflected in the following table (in thousands, except per share amounts):

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2017		2016		2017		2016
Net income	$	80,316	$	91,616	$	158,837	$	175,032
Basic:
Weighted average shares	124,617		128,586		125,074		128,933
Diluted:
Weighted average shares	124,617		128,586		125,074		128,933
Dilutive effect of potential common shares	487		743		684		800
Diluted weighted average shares	125,104		129,329		125,758		129,733
Net income per share:
Basic	$	.64	$	.71	$	1.27	$	1.36
Diluted	$	.64	$	.71	$	1.26	$	1.35