Income Taxes (Reconciliation Of The Difference Between The Provision For Income Taxes And The Expected Tax Provision At The Weighted Average Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Reconciliation Of Income Tax Provision [Line Items]
Total income tax expense (benefit)	$ (153,461)	$ (19,516)	$ 132,332
U.S. [Member]
Income Tax Reconciliation Of Income Tax Provision [Line Items]
Pre-tax income (loss)	(395,206)	141,142	422,027
Expected tax provision at the applicable statutory rate(s)	(138,322)	49,436	147,758
Increase (decrease) in taxes resulting from: Tax exempt income	(33,672)	(56,457)	(60,378)
Increase (decrease) in taxes resulting from: Dividend received deduction	(6,893)	(2,784)	(1,409)
Increase (decrease) in taxes resulting from: Proration	5,080	8,510	9,139
Increase (decrease) in taxes resulting from: Tax audit settlement	(710)	(48,867)	(9,690)
Increase (decrease) in taxes resulting from: Other	6,668	(4,410)	17,467
Total income tax expense (benefit)	(167,849)	(54,572)	102,887
Non-U.S. [Member]
Income Tax Reconciliation Of Income Tax Provision [Line Items]
Pre-tax income (loss)	161,260	450,097	517,294
Expected tax provision at the applicable statutory rate(s)	12,216	33,716	28,600
Increase (decrease) in taxes resulting from: Other	2,172	1,340	845
Total income tax expense (benefit)	$ 14,388	$ 35,056	$ 29,445

Income Taxes (Reconciliation Of The Difference Between The Provision For Income Taxes And The Expected Tax Provision At The Weighted Average Tax Rate) (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Income Tax Reconciliation Of Income Tax Provision [Line Items]

Total income tax expense (benefit)

$ (153,461)

$ (19,516)

$ 132,332

U.S. [Member]

Income Tax Reconciliation Of Income Tax Provision [Line Items]

Pre-tax income (loss)

(395,206)

141,142

422,027

Expected tax provision at the applicable statutory rate(s)

(138,322)

49,436

147,758

Increase (decrease) in taxes resulting from: Tax exempt income

(33,672)

(56,457)

(60,378)

Increase (decrease) in taxes resulting from: Dividend received deduction

(6,893)

(2,784)

(1,409)

Increase (decrease) in taxes resulting from: Proration

5,080

8,510

9,139

Increase (decrease) in taxes resulting from: Tax audit settlement

(710)

(48,867)

(9,690)

Increase (decrease) in taxes resulting from: Other

6,668

(4,410)

17,467

Total income tax expense (benefit)

(167,849)

(54,572)

102,887

Non-U.S. [Member]

Income Tax Reconciliation Of Income Tax Provision [Line Items]

Pre-tax income (loss)

161,260

450,097

517,294

Expected tax provision at the applicable statutory rate(s)

12,216

33,716

28,600

Increase (decrease) in taxes resulting from: Other

2,172

1,340

845

Total income tax expense (benefit)

$ 14,388

$ 35,056

$ 29,445

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

Reference 4: 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.

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-Publisher FASB

-Name Accounting Standards Codification

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the deduction for dividends paid or received under enacted tax laws.

+ References

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

-Publisher FASB

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-SubTopic 10

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-Paragraph 13

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

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

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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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to income that is exempt from income taxes under enacted tax laws.

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