Net Income Per Share

9 Months Ended

Sep. 30, 2016

The calculation of net income per share for the three and nine months ended September 30, 2016 and 2015 is reflected in the following table (in thousands, except per share amounts):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015

Net income	$	90,569	$	96,725	$	265,601	$	264,353
Basic:
Weighted average shares	127,615		131,285		128,491		132,280

Diluted:
Weighted average shares	127,615		131,285		128,491		132,280
Dilutive effect of potential common shares	576		1,203		725		1,156
Diluted weighted average shares	128,191		132,488		129,216		133,436

Net income per share:
Basic	$	.71	$	.74	$	2.07	$	2.00
Diluted	$	.71	$	.73	$	2.06	$	1.98

Potential common shares include the dilutive effect of stock options, unvested performance-based restricted stock, restricted stock which contains forfeitable rights to dividends, and stock units. The weighted average diluted common shares outstanding for the three and nine months ended September 30, 2016 and 2015, excludes the effect of the following (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2016	2015	2016	2015
Total number of anti-dilutive potential common shares	310	247	169	168