Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 12,708,891	$ 12,391,164
Fixed maturity securities - available for sale, Market Value	13,019,176	12,636,907
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Due in one year or less, Amortized Cost	1,305,956	1,059,052
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	5,567,088	5,565,112
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	2,237,873	2,081,908
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	968,937	960,812
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,316,967	1,067,799
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	5,728,265	5,740,662
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	2,278,200	2,101,234
Fixed maturity securities - available for sale, Due after ten years, Market Value	1,043,597	999,856
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	181,005	169,980
Fixed maturity securities - available for sale, Market Value	184,064	173,043
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	234,356	254,765
Fixed maturity securities - available for sale, Market Value	249,334	270,441
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,209,374	2,294,719
Fixed maturity securities - available for sale, Market Value	2,214,344	2,279,053
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	4,302	4,816
Fixed maturity securities - available for sale, Market Value	$ 4,405	$ 4,819

Amount of debt securities categorized neither as held-to-maturity nor trading, held at market value.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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