Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Reconciliation between Basic and Diluted Weighted Average Shares Outstanding

The following is a reconciliation between basic and diluted weighted average shares outstanding:

	For the three months ended March 31,
(in thousands, except per share data)	2013			2012
Net income	$	60,131		$	49,433
Net income attributable to unvested awarded performance stock		(1,308	)		(1,499	)
Net income attributable to common shares	$	58,823		$	47,934
Weighted average number of common shares outstanding – basic		143,926			143,347
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic		(3,130	)		(4,346	)
Weighted average number of common shares outstanding for basic earnings per common share		140,796			139,001
Dilutive effect of stock options		2,151			2,499
Weighted average number of shares outstanding – diluted		142,947			141,500
Net income per share:
Basic	$	0.42		$	0.34
Diluted	$	0.41		$	0.34