Earnings Per Share

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Earnings Per Share

(8)Earnings Per Share

The following table details the numerator and denominator used in our earnings per share calculations.

		Nine months ended September 30,				Three months ended September 30,
		2012		2011		2012		2011
Net earnings		$	283,139	$	176,905	$	107,062	$	60,437
Less: net earnings attributable to unvested restricted stock			(5,150)		(2,551)		(1,912)		(950)
	Net earnings available to common stock	$	277,989	$	174,354	$	105,150	$	59,487
Weighted-average common shares outstanding			100,340		110,665		99,424		106,919
Dilutive effect of outstanding options (determined using
	treasury stock method)		261		245		276		129
	Weighted-average common shares and potential
	common shares outstanding		100,601		110,910		99,700		107,048
Anti-dilutive stock options not included in treasury stock
	method computation		717		2,279		461		2,744