Earnings per Share

9 Months Ended

Sep. 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				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Numerator:
Net income used for calculating basic and diluted earnings per share	$	38,194	$	31,375	$	121,383	$	107,080
Denominator:
Weighted average number of common shares used in the calculation of basic earnings per share	92,689		93,522		93,286		93,429
Common stock equivalents associated with stock-based compensation plans (1)	1,666		2,089		1,814		2,362
Shares used in the calculation of diluted earnings per share	94,355		95,611		95,100		95,791
Basic earnings per share	$	0.41	$	0.34	$	1.30	$	1.15
Diluted earnings per share	$	0.40	$	0.33	$	1.28	$	1.12

(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 for both the three months ended September 30, 2013 and 2012 and 0.3 million and 0.7 million for the nine months ended September 30, 2013 and 2012, respectively.