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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 77,155	$ 77,041
Held for investment	68,108	76,460
Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	44,353,741	43,116,759
Available for sale, gross unrealized gains	1,304,091	2,525,131
Available for sale, gross unrealized losses	(858,462)	(268,901)
Available for sale, fair value	44,799,370	45,372,989
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	11,693	11,861
Available for sale, gross unrealized gains	96	162
Available for sale, gross unrealized losses	(434)	(147)
Available for sale, fair value	11,355	11,876
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,308,334	1,308,290
Available for sale, gross unrealized gains	16,776	28,457
Available for sale, gross unrealized losses	(75,670)	(31,730)
Available for sale, fair value	1,249,440	1,305,017
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	3,914,553	3,804,360
Available for sale, gross unrealized gains	274,464	366,048
Available for sale, gross unrealized losses	(14,835)	(3,596)
Available for sale, fair value	4,174,182	4,166,812
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	227,542	228,214
Available for sale, gross unrealized gains	6,742	13,171
Available for sale, gross unrealized losses	(5,671)	(2,025)
Available for sale, fair value	228,613	239,360
Fixed Maturity Securities [Member] | Corporate Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	28,015,515	28,127,653
Available for sale, gross unrealized gains	868,904	1,897,005
Available for sale, gross unrealized losses	(611,887)	(145,687)
Available for sale, fair value	28,272,532	29,878,971
Held for investment, amortized cost	77,155	77,041
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(9,047)	(581)
Held for investment	68,108	76,460
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,147,738	1,028,484
Available for sale, gross unrealized gains	67,642	79,554
Available for sale, gross unrealized losses	(7,774)	(2,471)
Available for sale, fair value	1,207,606	1,105,567
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	5,426,483	5,531,922
Available for sale, gross unrealized gains	26,015	82,768
Available for sale, gross unrealized losses	(121,324)	(69,840)
Available for sale, fair value	5,331,174	5,544,850
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	4,301,883	3,075,975
Available for sale, gross unrealized gains	43,452	57,966
Available for sale, gross unrealized losses	(20,867)	(13,405)
Available for sale, fair value	$ 4,324,468	3,120,536
Equity Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost		292,429
Available for sale, gross unrealized gains		0
Available for sale, gross unrealized losses		0
Available for sale, fair value		$ 292,429

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