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Dividends (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended				12 Months Ended
	Oct. 12, 2010	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Dividends [Abstract]
Total cash dividends paid		$ 10,734,000	$ 10,592,000	$ 10,500,000	$ 10,402,000	$ 42,228,000	$ 39,285,000	$ 32,246,000
Dividend per common share to be paid						$ 0.16125
Dividend declared date						Jan. 24, 2012
Dividend payable date	Nov. 12, 2010	Nov. 18, 2011	Aug. 19, 2011	May 13, 2011	Mar. 04, 2011	Mar. 16, 2012
Dividend record date	Nov. 08, 2010	Oct. 28, 2011	Jul. 29, 2011	Apr. 22, 2011	Feb. 11, 2011	Feb. 24, 2012
Percentage of stock dividend paid	50.00%
Stock shares increase due to three-for-two stock split							22,000,000

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Percentage of Common Stock Dividend Paid.

+ References

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Aggregate dividends declared during the period for each share of common stock outstanding.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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The day, month, and year (YYYY-MM-DD) that the dividend declared as of or prior to the financial reporting date will be paid in the subsequent period.

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-Name Accounting Standards Codification

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The day, month and year (YYYY-MM-DD) that the dividend to be paid was declared.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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The date as of when a holder must own the stock to be entitled to the dividend. The ex-dividend date is generally 3 days before the record date.

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The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.

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Number of shares issued during the period as a result of a stock split.

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