Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands, except per share data)	2012		2011		2012		2011
Net earnings	$	18,126	$	134,001	$	133,040	$	186,670
Less: net earnings allocable to participating securities	118		1,207		709		1,797
Net earnings available for common shareholders	$	18,008	$	132,794	$	132,331	$	184,873
Basic net earnings per share	$	0.33	$	2.45	$	2.41	$	3.42
Diluted net earnings per share	$	0.33	$	2.42	$	2.39	$	3.38
Basic weighted average shares outstanding	54,945		54,211		54,883		54,029
Add: Dilutive effects of stock options and RSUs	336		654		395		743
Dilutive weighted average shares outstanding	55,281		54,865		55,278		54,772