Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Share

Computation Of Basic And Diluted Earnings Per Share

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands, except per share data)	2011		2010		2011		2010
Net income attributable to common shareholders	$	50,437	$	40,041	$	98,904	$	73,275
Average basic shares outstanding		58,173		58,909		58,259		58,777
Effect of dilutive stock options		1,175		985		1,198		939
Average diluted shares outstanding		59,348		59,894		59,457		59,716
Earnings per basic share	$	0.87	$	0.68	$	1.70	$	1.25
Earnings per diluted share	$	0.85	$	0.67	$	1.66	$	1.23