Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Earnings Per Share

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands, except per share data)	2011		2010		2011		2010
Net income attributable to common shareholders	$	52,540	$	41,507	$	151,444	$	114,782
Average basic shares outstanding		58,048		58,608		58,202		58,710
Effect of dilutive stock options		1,010		917		1,128		935
Average diluted shares outstanding		59,058		59,525		59,330		59,645
Earnings per basic share	$	0.91	$	0.71	$	2.60	$	1.96
Earnings per diluted share	$	0.89	$	0.70	$	2.55	$	1.92