Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 12,831,159	$ 12,391,164
Fixed maturity securities - available for sale, Market Value	13,101,067	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	1,183,247	1,059,052
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	5,646,466	5,565,112
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	2,270,073	2,081,908
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	999,257	960,812
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,189,416	1,067,799
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	5,726,277	5,740,662
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	2,313,672	2,101,234
Fixed maturity securities - available for sale, Due after ten years, Market Value	1,102,900	999,856
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	340,761	169,980
Fixed maturity securities - available for sale, Market Value	341,222	173,043
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	231,439	254,765
Fixed maturity securities - available for sale, Market Value	241,685	270,441
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,157,182	2,294,719
Fixed maturity securities - available for sale, Market Value	2,183,164	2,279,053
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,734	4,816
Fixed maturity securities - available for sale, Market Value	$ 2,731	$ 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 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 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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