Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Reconciliation between Basic and Diluted Weighted Average Shares Outstanding

	For the three months   ended June 30,						For the six months   ended June 30,
(in thousands, except per share data)	2019			2018			2019			2018
Net income	$	92,593		$	73,922		$	206,489		$	164,750
Net income attributable to unvested awarded performance stock	(3,020		)	(1,618		)	(6,273		)	(3,529		)
Net income attributable to common shares	$	89,573		$	72,304		$	200,216		$	161,221
Weighted average number of common shares outstanding – basic	281,754			276,123			281,163			276,038
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic	(9,191		)	(6,042		)	(8,542		)	(5,912		)
Weighted average number of common shares outstanding for basic net income per common share	272,563			270,081			272,621			270,126
Dilutive effect of stock options	1,839			5,827			2,083			5,683
Weighted average number of shares outstanding – diluted	274,402			275,908			274,704			275,809
Net income per share:
Basic	$	0.33		$	0.27		$	0.73		$	0.60
Diluted	$	0.33		$	0.26		$	0.73		$	0.58