Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Calculation of Net Income Per Share

The calculation of net income per share for the three and nine months ended September 30, 2012 and 2011 is reflected in the following table (in thousands, except per share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Basic net income per share:
Net income	$	57,660	$	44,168	$	151,323	$	107,298
Income allocated to participating securities—basic		278		615		776		1,564
Net income available to common stockholders—basic	$	57,382	$	43,553	$	150,547	$	105,734
Basic weighted average shares		137,918		139,449		138,627		141,118
Basic net income per share	$	.42	$	.31	$	1.09	$	.75
Diluted net income per share:
Net income	$	57,660	$	44,168	$	151,323	$	107,298
Income allocated to participating securities—diluted		277		612		772		1,558
Net income available to common stockholders—diluted	$	57,383	$	43,556	$	150,551	$	105,740
Basic weighted average shares		137,918		139,449		138,627		141,118
Dilutive effect of potential common shares		1,223		984		1,108		1,255
Diluted weighted average shares		139,141		140,433		139,735		142,373
Diluted net income per share	$	.41	$	.31	$	1.08	$	.74

Weighted Average Diluted Common Shares Outstanding

The weighted average diluted common shares outstanding for the three and nine months ended September 30, 2012 and 2011, excludes the effect of the following (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Total number of anti-dilutive potential common shares		406		2,996		231		764