The amount of the quarterly dividend per share after the approved dividend increase on a post-split basis.

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- Definition

The amount of the quarterly dividend per share after the approved dividend increase on a pre-split basis.

+ Details

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- Definition

The amount of the quarterly dividend per share before the approved dividend increase on a post-split basis.

+ Details

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- Definition

The amount of the quarterly dividend per share before the approved dividend increase on a pre-split basis.

+ Details

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- Definition

The weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

+ Details

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- Definition

Description of the total capital structure change due to a stock dividend, stock split and reserve split occurring after the balance sheet date but prior to the later of the issuance of financial statement or the effective date of registration statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The weighted average number of shares (units) outstanding in the calculation of pro forma basic earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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Earnings Per Common Share Subsequent Events (Details) (USD $)	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 Stock Split [Member]	Jun. 30, 2010 Stock Split [Member]	Jun. 30, 2011 Stock Split [Member]	Jun. 30, 2010 Stock Split [Member]	Jul. 22, 2011 Dividend Increase [Member]
Subsequent Event [Line Items]
Stockholders' Equity Note, Changes in Capital Structure, Retroactive Impact	On July 22, 2011, the Board of Directors authorized a three-for-two stock split. An additional one-half common share for every common share held of record as of August 10, 2011 will be distributed on August 24, 2011.
Weighted Average Basic Shares Outstanding, Pro Forma		121,692,663	120,156,006	121,557,144	119,885,685
Pro Forma Weighted Average Shares Outstanding, Diluted		126,191,424	121,639,055	125,268,488	121,355,205
Dividend Per Share Before Increase Pre-split						$ 0.54
Dividend Per Share After Increase Pre-Split						$ 0.60
Dividend Per Share Before Increase Post-split						$ 0.36
Dividend Per Share After Increase Post-split						$ 0.40