Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

	Three Months Ended
	March 31,
(in thousands, except per share data)	2013		2012
Net earnings	$	32,434	$	33,898
Less: net earnings allocable to participating securities	81		171
Net earnings available for common shareholders	$	32,353	$	33,727
Basic net earnings per share	$	0.59	$	0.62
Diluted net earnings per share	$	0.58	$	0.61
Basic weighted average shares outstanding	55,186		54,759
Add: Dilutive effects of stock options and RSUs	379		504
Dilutive weighted average shares outstanding	55,565		55,263