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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 77,213	$ 77,041
Held for investment	71,113	76,460
Fixed Maturity Securities
Investment Holdings [Line Items]
Available for sale, amortized cost	45,688,342	43,116,759
Available for sale, gross unrealized gains	1,113,062	2,525,131
Available for sale, gross unrealized losses	(979,387)	(268,901)
Available for sale, fair value	45,822,017	45,372,989
Fixed Maturity Securities | United States Government Full Faith and Credit
Investment Holdings [Line Items]
Available for sale, amortized cost	11,528	11,861
Available for sale, gross unrealized gains	79	162
Available for sale, gross unrealized losses	(645)	(147)
Available for sale, fair value	10,962	11,876
Fixed Maturity Securities | United States Government Sponsored Agencies
Investment Holdings [Line Items]
Available for sale, amortized cost	1,308,358	1,308,290
Available for sale, gross unrealized gains	11,824	28,457
Available for sale, gross unrealized losses	(95,595)	(31,730)
Available for sale, fair value	1,224,587	1,305,017
Fixed Maturity Securities | United States Municipalities, States and Territories
Investment Holdings [Line Items]
Available for sale, amortized cost	3,949,293	3,804,360
Available for sale, gross unrealized gains	224,586	366,048
Available for sale, gross unrealized losses	(31,622)	(3,596)
Available for sale, fair value	4,142,257	4,166,812
Fixed Maturity Securities | Foreign Government Obligations
Investment Holdings [Line Items]
Available for sale, amortized cost	226,931	228,214
Available for sale, gross unrealized gains	7,240	13,171
Available for sale, gross unrealized losses	(7,671)	(2,025)
Available for sale, fair value	226,500	239,360
Fixed Maturity Securities | Corporate Securities
Investment Holdings [Line Items]
Available for sale, amortized cost	28,406,182	28,127,653
Available for sale, gross unrealized gains	746,913	1,897,005
Available for sale, gross unrealized losses	(673,492)	(145,687)
Available for sale, fair value	28,479,603	29,878,971
Held for investment, amortized cost	77,213	77,041
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(6,100)	(581)
Held for investment	71,113	76,460
Fixed Maturity Securities | Residential Mortgage Backed Securities
Investment Holdings [Line Items]
Available for sale, amortized cost	1,129,176	1,028,484
Available for sale, gross unrealized gains	64,183	79,554
Available for sale, gross unrealized losses	(11,677)	(2,471)
Available for sale, fair value	1,181,682	1,105,567
Fixed Maturity Securities | Commercial Mortgage Backed Securities
Investment Holdings [Line Items]
Available for sale, amortized cost	5,434,044	5,531,922
Available for sale, gross unrealized gains	22,684	82,768
Available for sale, gross unrealized losses	(119,360)	(69,840)
Available for sale, fair value	5,337,368	5,544,850
Fixed Maturity Securities | Other Asset Backed Securities
Investment Holdings [Line Items]
Available for sale, amortized cost	5,222,830	3,075,975
Available for sale, gross unrealized gains	35,553	57,966
Available for sale, gross unrealized losses	(39,325)	(13,405)
Available for sale, fair value	$ 5,219,058	3,120,536
Equity Securities
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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