Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Earnings Per Share

	Three Months Ended March 31,
(in thousands, except per share data)	2012		2011
Net income attributable to common shareholders	$	51,662	$	48,467
Average basic shares outstanding		57,889		58,330
Effect of dilutive stock options		991		1,222
Average diluted shares outstanding		58,880		59,552
Earnings per basic share	$	0.89	$	0.83
Earnings per diluted share	$	0.88	$	0.81