v2.4.0.6

Stockholders' Equity (Summary Of Dividends Declared) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Q1 2011 [Member]	Dec. 31, 2011 Q2 2011 [Member]	Dec. 31, 2011 Q3 2011 [Member]	Dec. 31, 2011 Q4 2011 [Member]	Dec. 31, 2010 Q1 2010 [Member]	Dec. 31, 2010 Q2 2010 [Member]	Dec. 31, 2010 Q3 2010 [Member]	Dec. 31, 2010 Q4 2010 [Member]
Dividends Payable [Line Items]
Declaration Date	Feb. 09, 2011	Apr. 27, 2011	Jul. 26, 2011	Oct. 26, 2011	Feb. 10, 2010	Apr. 27, 2010	Jul. 26, 2010	Oct. 25, 2010
Dividends Per Share	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14
Record Date	Mar. 11, 2011	May 27, 2011	Aug. 26, 2011	Nov. 18, 2011	Mar. 11, 2010	May 27, 2010	Aug. 26, 2010	Nov. 18, 2010
Total Amount	$ 19,352	$ 19,232	$ 19,148	$ 18,818	$ 20,220	$ 19,902	$ 19,703	$ 19,251
Payment Date	Mar. 31, 2011	Jun. 17, 2011	Sep. 16, 2011	Dec. 09, 2011	Mar. 31, 2010	Jun. 17, 2010	Sep. 16, 2010	Dec. 09, 2010

X

- Definition

Dividends Declared, Date Paid, Month, Day and Year.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate amount of dividends paid during the period.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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X

- Definition

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

+ References

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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X

- Definition

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.

+ References

No definition available.

+ Details

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- Details

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