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Equity (Details 1) (USD $) In Thousands, except Per Share data	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Summary of Dividends paid
Dividends declared per common share	$ 0.21	$ 0.21	$ 0.18	$ 0.63	$ 0.54
Total dividend paid				$ 71,856
First quarter dividend [Member]
Summary of Dividends paid
Declaration Date				Feb. 24, 2011
Record Date				Mar. 04, 2011
Date Paid				Mar. 16, 2011
Dividends declared per common share				$ 0.21
Total dividend paid				23,897
Second quarter dividend [Member]
Summary of Dividends paid
Declaration Date				May 12, 2011
Record Date				Jun. 06, 2011
Date Paid				Jun. 17, 2011
Dividends declared per common share				$ 0.21
Total dividend paid				23,976
Third quarter dividend [Member]
Summary of Dividends paid
Declaration Date				Aug. 04, 2011
Record Date				Aug. 17, 2011
Date Paid				Sep. 01, 2011
Dividends declared per common share				$ 0.21
Total dividend paid				$ 23,983

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- Definition

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+ 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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- Definition

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+ References

Reference 1: 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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- Definition

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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