Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands, except per share data)	2012		2011		2012		2011
Net earnings	$	81,016	$	105,166	$	114,914	$	52,669
Less: net earnings allocable to participating securities	399		1,012		556		544
Net earnings available for common shareholders	$	80,617	$	104,154	$	114,358	$	52,125
Basic net earnings per share	$	1.47	$	1.93	$	2.08	$	0.97
Diluted net earnings per share	$	1.46	$	1.90	$	2.07	$	0.95
Weighted average shares outstanding—basic	54,942		54,004		54,851		53,936
Add: Dilutive effects of stock options and RSUs	352		704		451		755
Weighted average shares outstanding—dilutive	55,294		54,708		55,302		54,691