Earnings per Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share

The following table sets forth the calculations of basic and diluted earnings per share (in thousands, except per share data):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Numerator:
Net income used for calculating basic and diluted earnings per share	$	46,514	$	41,484	$	83,189	$	75,705
Denominator:
Weighted average number of common shares used in the calculation of basic earnings per share	93,574		93,350		93,584		93,383
Common stock equivalents associated with stock-based compensation plans (1)	1,614		2,073		1,842		2,443
Shares used in the calculation of diluted earnings per share	95,188		95,423		95,426		95,826
Basic earnings per share	$	0.50	$	0.44	$	0.89	$	0.81
Diluted earnings per share	$	0.49	$	0.43	$	0.87	$	0.79

(1) Certain common stock equivalents were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive. These shares totaled 0.4 million and 0.7 million for the three months ended June 30, 2013 and 2012, respectively, and 0.3 million and 0.7 million for the six months ended June 30, 2013 and 2012, respectively.