Earnings Per Share

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Earnings Per Share

(6)Earnings Per Share

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

		Six months ended June 30,				Three months ended June 30,
		2012		2011		2012		2011
Net earnings		$	176,077	$	116,468	$	93,493	$	69,478
Less: net earnings attributable to unvested restricted stock			(3,238)		(1,601)		(1,775)		(1,003)
	Net earnings available to common stock	$	172,839	$	114,867	$	91,718	$	68,475
Weighted-average common shares outstanding			100,802		112,569		99,563		111,389
Dilutive effect of outstanding options (determined using
	treasury stock method)		181		375		288		368
	Weighted-average common shares and potential common
	shares outstanding		100,983		112,944		99,851		111,757
Anti-dilutive stock options not included in treasury stock
	method computation		1,990		917		642		424