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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Abstract]      
Expected income tax provision at the U.S. statutory tax rate $ 421,924 $ 242,664 $ (130,724)
Expected income tax provision at the U.S. statutory tax rate, rate 35.00% 35.00% 35.00%
Increase (reduction) in tax resulting from: Tax exempt income (15,038) (20,623) (33,672)
Increase (reduction) in tax resulting from: Tax exempt income, rate (3.10%) (3.00%) 9.00%
Increase (reduction) in tax resulting from: Dividend received deduction (7,328) (7,924) (6,517)
Increase (reduction) in tax resulting from: Dividend received deduction, rate (1.50%) (1.10%) 1.70%
Increase (reduction) in tax resulting from: Proration 2,274 3,138 5,080
Increase (reduction) in tax resulting from: Proration, rate 0.50% 0.50% (1.40%)
Increase (reduction) in tax resulting from: Tax audit settlement   (2,508) (710)
Increase (reduction) in tax resulting from: Tax audit settlement, rate 0.00% (0.40%) 0.20%
Increase (reduction) in tax resulting from: Uncertain tax positions   (31,912) 8,139
Increase (reduction) in tax resulting from: Uncertain tax positions, rate 0.00% (4.60%) (2.20%)
Increase (reduction) iin taxes resulting from: Other 5,406 (9,840) (12,273)
Increase (reduction) in taxes resulting from: Other, rate 2.90% (1.40%) 3.30%
Total income tax provision $ 407,238 $ 172,995 $ (170,677)
Total effective tax rate 33.80% 25.00% 45.70%