Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands, except per share data)	2013		2012		2013		2012
Net earnings	$	61,364	$	81,016	$	93,798	$	114,914
Less: net earnings allocable to participating securities	112		399		194		556
Net earnings available for common shareholders	$	61,252	$	80,617	$	93,604	$	114,358
Basic net earnings per share	$	1.11	$	1.47	$	1.69	$	2.08
Diluted net earnings per share	$	1.10	$	1.46	$	1.68	$	2.07
Basic weighted average shares outstanding	55,302		54,942		55,245		54,851
Add: Dilutive effects of stock options and RSUs	417		352		406		451
Dilutive weighted average shares outstanding	55,719		55,294		55,651		55,302