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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 76,986	$ 76,825
Held for investment	75,046	68,766
Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	42,486,275	39,953,955
Available for sale, gross unrealized gains	2,393,616	1,691,257
Available for sale, gross unrealized losses	(278,594)	(584,718)
Available for sale, fair value	44,601,297	41,060,494
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	11,864	11,864
Available for sale, gross unrealized gains	210	229
Available for sale, gross unrealized losses	(139)	(288)
Available for sale, fair value	11,935	11,805
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,306,423	1,368,340
Available for sale, gross unrealized gains	29,350	23,360
Available for sale, gross unrealized losses	(33,698)	(46,913)
Available for sale, fair value	1,302,075	1,344,787
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	3,737,212	3,626,395
Available for sale, gross unrealized gains	362,914	322,948
Available for sale, gross unrealized losses	(6,494)	(22,393)
Available for sale, fair value	4,093,632	3,926,950
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	228,291	229,589
Available for sale, gross unrealized gains	13,821	11,832
Available for sale, gross unrealized losses	(1,712)	(5,080)
Available for sale, fair value	240,400	236,341
Fixed Maturity Securities [Member] | Corporate Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	28,071,650	26,333,213
Available for sale, gross unrealized gains	1,755,592	1,149,978
Available for sale, gross unrealized losses	(151,318)	(368,773)
Available for sale, fair value	29,675,924	27,114,418
Held for investment, amortized cost	76,986	76,825
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(1,940)	(8,059)
Held for investment	75,046	68,766
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,060,247	1,166,944
Available for sale, gross unrealized gains	88,841	91,445
Available for sale, gross unrealized losses	(2,266)	(3,554)
Available for sale, fair value	1,146,822	1,254,835
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	5,510,057	5,422,255
Available for sale, gross unrealized gains	90,743	59,994
Available for sale, gross unrealized losses	(68,317)	(117,014)
Available for sale, fair value	5,532,483	5,365,235
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	2,560,531	1,795,355
Available for sale, gross unrealized gains	52,145	31,471
Available for sale, gross unrealized losses	(14,650)	(20,703)
Available for sale, fair value	2,598,026	1,806,123
Equity Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	7,427	7,521
Available for sale, gross unrealized gains	0	479
Available for sale, gross unrealized losses	0	0
Available for sale, fair value	$ 7,427	$ 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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