Earnings Per Share

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share

(10)Earnings Per Share

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

		2012		2011		2010
Net earnings		$	391,240	$	255,243	$	345,096
Less: net earnings attributable to unvested restricted stock			(6,982)		(3,864)		(3,926)
	Net earnings available to common stock	$	384,258	$	251,379	$	341,170
Weighted-average common shares outstanding			100,176		109,051		113,863
Dilutive effect of outstanding options (determined using treasury
	stock method)		280		189		214
	Weighted-average common shares and potential common
	shares outstanding		100,456		109,240		114,077
Anti-dilutive stock options not included in treasury stock
	method computation		443		2,426		4,451