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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

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)		2013				2012				2011
Net income		$	217,112			$	184,045			$	163,995
Net income attributable to unvested awarded performance stock			(5,446	)			(5,313	)			(5,099	)
Net income attributable to common shares		$	211,666			$	178,732			$	158,896
Weighted average basic number of common shares outstanding			144,662				143,507				143,029
Less unvested awarded performance stock included in weighted average basic share outstanding			(3,629	)			(4,143	)			(4,447	)
Weighted average number of common shares outstanding for basic earnings per common share			141,033				139,364				138,582
Dilutive effect of stock options			1,591				2,646				1,682
Weighted average number of shares outstanding			142,624				142,010				140,264
Net income per share:
Basic		$	1.50			$	1.28			$	1.15
Diluted		$	1.48			$	1.26			$	1.13

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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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

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

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