Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2016

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)	2016			2015
Net income	$	62,070		$	56,951
Net income attributable to unvested awarded performance stock	(1,451		)	(1,363		)
Net income attributable to common shares	$	60,619		$	55,588
Weighted average number of common shares outstanding – basic	138,793			142,777
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic	(3,245		)	(3,417		)
Weighted average number of common shares outstanding for basic earnings per common share	135,548			139,360
Dilutive effect of stock options	1,392			2,127
Weighted average number of shares outstanding – diluted	136,940			141,487
Net income per share:
Basic	$	0.45		$	0.40
Diluted	$	0.44		$	0.39