Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 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 September 30,						For the nine months ended September 30,
(in thousands, except per share data)	2013			2012			2013			2012
Net income	$	57,749		$	49,504		$	169,887		$	141,408
Net income attributable to unvested awarded performance stock		(1,626	)		(1,428	)		(4,092	)		(4,174	)
Net income attributable to common shares	$	56,123		$	48,076		$	165,795		$	137,234
Weighted average number of common shares outstanding – basic		145,228			143,607			144,403			143,418
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic		(4,089	)		(4,142	)		(3,478	)		(4,233	)
Weighted average number of common shares outstanding for basic earnings per common share		141,139			139,465			140,925			139,185
Dilutive effect of stock options		1,650			2,632			1,551			2,584
Weighted average number of shares outstanding – diluted		142,789			142,097			142,476			141,769
Net income per share:
Basic	$	0.40		$	0.34		$	1.18		$	0.99
Diluted	$	0.39		$	0.34		$	1.16		$	0.97