Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [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 years ended December 31:

(in thousands, except per share data)	2021			2020			2019
Net income	$	587,104		$	480,483		$	398,514
Net income attributable to unvested awarded    performance stock		(12,942	)		(15,197	)		(12,873	)
Net income attributable to common shares	$	574,162		$	465,286		$	385,641
Weighted average number of common shares    outstanding – basic		282,246			283,294			281,566
Less unvested awarded performance stock    included in weighted average number of    common shares outstanding – basic		(6,222	)		(8,960	)		(9,095	)
Weighted average number of common    shares outstanding for basic earnings    per common share		276,024			274,334			272,471
Dilutive effect of stock options		1,390			1,533			2,145
Weighted average number of shares    outstanding – diluted		277,414			275,867			274,616
Net income per share:
Basic	$	2.08		$	1.70		$	1.42
Diluted	$	2.07		$	1.69		$	1.40