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Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Net Income Per Share [Abstract]

Reconciliation Between Basic And Diluted Weighted Average Shares Outstanding

		For the three months ended March 31,
(in thousands, except per share data)		2012				2011
Net income		$	49,433			$	46,293
Net income attributable to unvested awarded performance stock			(1,499	)			(1,391	)
Net income attributable to common shares		$	47,934			$	44,902
Weighted average number of common shares outstanding—basic			143,347				142,637
Less unvested awarded performance stock included in weighted average number of common shares outstanding - basic			(4,346	)			(4,286	)
Weighted average number of common shares outstanding for basic earnings per common share			139,001				138,351
Dilutive effect of stock options			2,499				2,297
Weighted average number of shares outstanding - diluted			141,500				140,648
Net income per share:
Basic		$	0.34			$	0.32
Diluted		$	0.34			$	0.32

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- Definition

Disclosure of the methodology and assumptions used in the reconciliation of earnings per share, which may include the individual income and share amount effects of all securities that affect earnings per share, the effect that has been given to preferred dividends in arriving at income available to common stockholders in computing basic earnings per share, securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic EPS in the future that were not included in the computation of diluted EPS because to do so would have been antidilutive for the period(s) presented and a description of any transaction that occurs after the end of the most recent period but before issuance of the financial statements that would have changed materially the number of common shares or potential common shares outstanding at the end of the period if the transaction had occurred before the end of the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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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