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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 76,878	$ 76,825
Held for investment	70,795	68,766
Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	40,717,733	39,953,955
Available for sale, gross unrealized gains	1,848,086	1,691,257
Available for sale, gross unrealized losses	(460,453)	(584,718)
Available for sale, fair value	42,105,366	41,060,494
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	11,699	11,864
Available for sale, gross unrealized gains	225	229
Available for sale, gross unrealized losses	(252)	(288)
Available for sale, fair value	11,672	11,805
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,368,361	1,368,340
Available for sale, gross unrealized gains	25,803	23,360
Available for sale, gross unrealized losses	(53,376)	(46,913)
Available for sale, fair value	1,340,788	1,344,787
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	3,673,722	3,626,395
Available for sale, gross unrealized gains	334,483	322,948
Available for sale, gross unrealized losses	(18,903)	(22,393)
Available for sale, fair value	3,989,302	3,926,950
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	228,998	229,589
Available for sale, gross unrealized gains	12,047	11,832
Available for sale, gross unrealized losses	(2,647)	(5,080)
Available for sale, fair value	238,398	236,341
Fixed Maturity Securities [Member] | Corporate Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	27,149,697	26,333,213
Available for sale, gross unrealized gains	1,289,415	1,149,978
Available for sale, gross unrealized losses	(278,492)	(368,773)
Available for sale, fair value	28,160,620	27,114,418
Held for investment, amortized cost	76,878	76,825
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(6,083)	(8,059)
Held for investment	70,795	68,766
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,119,318	1,166,944
Available for sale, gross unrealized gains	84,885	91,445
Available for sale, gross unrealized losses	(4,163)	(3,554)
Available for sale, fair value	1,200,040	1,254,835
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	5,406,475	5,422,255
Available for sale, gross unrealized gains	65,691	59,994
Available for sale, gross unrealized losses	(88,224)	(117,014)
Available for sale, fair value	5,383,942	5,365,235
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,759,463	1,795,355
Available for sale, gross unrealized gains	35,537	31,471
Available for sale, gross unrealized losses	(14,396)	(20,703)
Available for sale, fair value	1,780,604	1,806,123
Equity Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	7,524	7,521
Available for sale, gross unrealized gains	466	479
Available for sale, gross unrealized losses	0	0
Available for sale, fair value	$ 7,990	$ 8,000

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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