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Federal Income Taxes (Components of Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Taxes (benefits) on earnings from continuing operations
Current	$ 29,395us-gaap_CurrentFederalTaxExpenseBenefit	$ 71,709us-gaap_CurrentFederalTaxExpenseBenefit	$ 51,886us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	22,538	(26,259)	(3,863)
Income Tax Expense (Benefit)	51,933us-gaap_IncomeTaxExpenseBenefit	45,450us-gaap_IncomeTaxExpenseBenefit	48,023us-gaap_IncomeTaxExpenseBenefit
Taxes (benefits) on components of stockholders' equity	1,938us-gaap_OtherComprehensiveIncomeLossTax	(21,604)us-gaap_OtherComprehensiveIncomeLossTax	12,443us-gaap_OtherComprehensiveIncomeLossTax
Total Federal income taxes (benefit)	53,870	23,856	60,467
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	4,072	(24,201)	13,011
Foreign Currency Translation Adjustments [Member]
Taxes (benefits) on earnings from continuing operations
Taxes (benefits) on components of stockholders' equity	(358)	(398)	(157)
Change in Benefit Liability [Member]
Taxes (benefits) on earnings from continuing operations
Taxes (benefits) on components of stockholders' equity	$ (1,777)	$ 3,005	$ (410)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.