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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 76,212	$ 76,088
Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	25,783,116	21,957,027
Available for sale, gross unrealized gains	1,121,104	2,283,010
Available for sale, gross unrealized losses	(641,342)	(67,901)
Available for sale securities, fair value	26,262,878	24,172,136
Equity Securities, Available For Sale [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	8,917	44,598
Available for sale, gross unrealized gains	791	10,227
Available for sale, gross unrealized losses	0	(1,403)
Available for sale securities, fair value	9,708	53,422
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	4,608	4,590
Available for sale, gross unrealized gains	342	564
Available for sale, gross unrealized losses	(43)	0
Available for sale securities, fair value	4,907	5,154
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,314,449	1,763,789
Available for sale, gross unrealized gains	4,069	11,704
Available for sale, gross unrealized losses	(78,915)	(3,468)
Available for sale securities, fair value	1,239,603	1,772,025
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	3,278,749	3,116,678
Available for sale, gross unrealized gains	212,975	461,770
Available for sale, gross unrealized losses	(30,593)	(125)
Available for sale securities, fair value	3,461,131	3,578,323
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	86,109	86,099
Available for sale, gross unrealized gains	9,365	19,160
Available for sale, gross unrealized losses	(2,792)	0
Available for sale securities, fair value	92,682	105,259
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	16,420,869	12,930,173
Available for sale, gross unrealized gains	720,010	1,568,223
Available for sale, gross unrealized losses	(399,298)	(31,624)
Available for sale securities, fair value	16,741,581	14,466,772
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment Securities [Member]
Investment Holdings [Line Items]
Held for investment, amortized cost	76,212	76,088
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(15,369)	(14,567)
Held for investment, fair value	60,843	61,521
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,999,201	2,743,537
Available for sale, gross unrealized gains	145,605	172,304
Available for sale, gross unrealized losses	(25,979)	(27,728)
Available for sale securities, fair value	2,118,827	2,888,113
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,664,541	354,870
Available for sale, gross unrealized gains	5,194	5,095
Available for sale, gross unrealized losses	(79,425)	(1,983)
Available for sale securities, fair value	1,590,310	357,982
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,014,590	957,291
Available for sale, gross unrealized gains	23,544	44,190
Available for sale, gross unrealized losses	(24,297)	(2,973)
Available for sale securities, fair value	$ 1,013,837	$ 998,508

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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