Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent (Details) - Computation of basic and diluted earnings per share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Basic earnings per ordinary share and ordinary share equivalents:
Net income (loss) attributable to ordinary shareholders	$ 171,902	$ 42,398	$ 569,686	$ 40,777
Weighted average ordinary shares outstanding	304,199	311,714	309,675	310,793
Basic earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)	$ 0.57	$ 0.14	$ 1.84	$ 0.13
Diluted earnings per ordinary share and ordinary share equivalents:
Net income (loss) attributable to ordinary shareholders	$ 171,902	$ 42,398	$ 569,686	$ 40,777
Weighted average ordinary shares outstanding - basic	304,199	311,714	309,675	310,793
Impact of share based compensation and certain conversion features	3,565	2,134	2,927	4,049
Weighted average ordinary shares outstanding - diluted	307,764	313,848	312,602	314,842
Diluted earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)	$ 0.56	$ 0.14	$ 1.82	$ 0.13
Dividends per ordinary share (in Dollars per share)	$ 0.11	$ 0.11	$ 0.33	$ 0.33

Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent (Details) - Computation of basic and diluted earnings per share (USD $)
In Thousands, except Per Share data, unless otherwise specified

3 Months Ended

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2012

Sep. 30, 2011

Basic earnings per ordinary share and ordinary share equivalents:

Net income (loss) attributable to ordinary shareholders

$ 171,902

$ 42,398

$ 569,686

$ 40,777

Weighted average ordinary shares outstanding

304,199

311,714

309,675

310,793

Basic earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)

$ 0.57

$ 0.14

$ 1.84

$ 0.13

Diluted earnings per ordinary share and ordinary share equivalents:

Net income (loss) attributable to ordinary shareholders

$ 171,902

$ 42,398

$ 569,686

$ 40,777

Weighted average ordinary shares outstanding - basic

304,199

311,714

309,675

310,793

Impact of share based compensation and certain conversion features

3,565

2,134

2,927

4,049

Weighted average ordinary shares outstanding - diluted

307,764

313,848

312,602

314,842

Diluted earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)

$ 0.56

$ 0.14

$ 1.82

$ 0.13

Dividends per ordinary share (in Dollars per share)

$ 0.11

$ 0.33

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

-Paragraph 4

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 36, 37, 38

-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 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 11: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

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-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 8

-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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

-Paragraph 4

-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.

+ Details