Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2014

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)	2014			2013			2014			2013
Net income	$	68,331		$	57,749		$	182,501		$	169,887
Net income attributable to unvested awarded performance stock		(1,681	)		(1,626	)		(4,604	)		(4,092	)
Net income attributable to common shares	$	66,650		$	56,123		$	177,897		$	165,795
Weighted average number of common shares outstanding – basic		144,469			145,228			144,909			144,403
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic		(3,554	)		(4,089	)		(3,656	)		(3,478	)
Weighted average number of common shares outstanding for basic earnings per common share		140,915			141,139			141,253			140,925
Dilutive effect of stock options		2,049			1,650			1,849			1,551
Weighted average number of shares outstanding – diluted		142,964			142,789			143,102			142,476
Net income per share:
Basic	$	0.47		$	0.40		$	1.26		$	1.18
Diluted	$	0.47		$	0.39		$	1.24		$	1.16