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Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies [Abstract]

Reconciliation Between Basic And Diluted Weighted Average Shares Outstanding

(in thousands, except per share data)		2011				2010				2009
Net income		$	163,995			$	161,752			$	153,294
Net income attributable to unvested awarded performance stock			(5,099	)			(5,097	)			(4,937	)
Net income attributable to common shares		$	158,896			$	156,655			$	148,357
Weighted average basic number of common shares outstanding			143,029				142,412				141,738
Less unvested awarded performance stock included in weighted average basic share outstanding			(4,447	)			(4,488	)			(4,565	)
Weighted average number of common shares outstanding for basic earnings per common share			138,582				137,924				137,173
Dilutive effect of stock options			1,682				1,394				334
Weighted average number of shares outstanding			140,264				139,318				137,507
Net income per share:
Basic		$	1.15			$	1.14			$	1.08
Diluted		$	1.13			$	1.12			$	1.08

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- Definition

Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic 260

-SubTopic 10

-Publisher FASB

-Number

-Article

-Subparagraph

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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