Federal Income Taxes (Components of Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Taxes (benefits) on earnings from continuing operations
Current	$ 51,886	$ 39,928	$ 27,468
Deferred	(3,863)	(12,719)	4,198
Income Tax Expense (Benefit)	48,023	27,209	31,666
Taxes (benefits) on components of stockholders' equity	12,443	1,490	17,580
Total Federal income taxes (benefit)	60,467	28,552	49,304
Net Unrealized Gains and Losses on Securities Available for Sale [Member]
Taxes (benefits) on earnings from continuing operations
Taxes (benefits) on components of stockholders' equity	13,011	2,986	17,024
Foreign Currency Translation Adjustments [Member]
Taxes (benefits) on earnings from continuing operations
Taxes (benefits) on components of stockholders' equity	(157)	197	(191)
Change in Benefit Liability [Member]
Taxes (benefits) on earnings from continuing operations
Taxes (benefits) on components of stockholders' equity	$ (410)	$ (1,840)	$ 805

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 289

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

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6509736

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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

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+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law.

+ References

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Deferred Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6510177

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-Name Staff Accounting Bulletin (SAB)

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+ Details

- Definition

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

+ References+ Details

- Definition

Tax effect of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.

+ References

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

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-Name Accounting Research Bulletin (ARB)

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+ Details