Earnings Per Share

6 Months Ended

Jun. 30, 2011

Earnings Per Share [Abstract]

Earnings Per Share

(7) 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,
	2011			2010			2011			2010
Net earnings	$	116,468		$	154,734		$	69,478		$	83,380
Less: net earnings attributable to unvested restricted stock awards and restricted stock units		(1,601	)		(1,679	)		(1,003	)		(927	)
Net earnings available to common stock	$	114,867		$	153,055		$	68,475		$	82,453
Weighted-average common shares outstanding		112,569			113,805			111,389			113,935
Dilutive effect of outstanding options (determined using treasury stock method)		375			322			368			253
Weighted-average common shares and potential common shares outstanding		112,944			114,127			111,757			114,188
Anti-dilutive stock options not included in treasury stock method computation		917			4,392			424			4,680