Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share

Components Of Basic And Diluted Earnings Per Share

	Three Months Ended September 30,					Nine Months Ended September 30,
	2011			2010		2011			2010
Numerator for basic and diluted net earnings per common share:
Net earnings	$	25,498		$	19,834	$	84,947		$	56,180
Net earnings available to participating securities (a)		(392	)		—		(1,414	)		—
Net earnings available to common shareholders		25,106			19,834		83,533			56,180
Denominator:
Weighted-average outstanding shares of common stock		45,993,328			44,716,366		45,498,763			44,488,561
Dilutive effect of:
Dilutive effect of equity incentive plans		462,256			1,222,806		610,127			1,249,828
Common stock and common stock equivalents		46,455,584			45,939,172		46,108,890			45,738,389
Net earnings per share:
Basic	$	0.55		$	0.44	$	1.84		$	1.26
Diluted	$	0.54		$	0.43	$	1.81		$	1.23

(a)       Represents unvested share-based payment awards that contain certain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid).