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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	$ 46,131,190	$ 43,116,759
Available for sale securities, gross unrealized gains	1,143,624	2,525,131
Available for sale securities, gross unrealized losses	(1,351,087)	(268,901)
Available for sale securities, fair value	45,923,727	45,372,989
Held for investment, amortized cost	0	77,041
Held for investment, fair value	0	76,460
United States Government Full Faith and Credit
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	11,872	11,861
Available for sale securities, gross unrealized gains	102	162
Available for sale securities, gross unrealized losses	(322)	(147)
Available for sale securities, fair value	11,652	11,876
United States Government Sponsored Agencies
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	1,208,468	1,308,290
Available for sale securities, gross unrealized gains	13,095	28,457
Available for sale securities, gross unrealized losses	(83,034)	(31,730)
Available for sale securities, fair value	1,138,529	1,305,017
United States Municipalities, States and Territories
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	3,880,703	3,804,360
Available for sale securities, gross unrealized gains	261,222	366,048
Available for sale securities, gross unrealized losses	(15,658)	(3,596)
Available for sale securities, fair value	4,126,267	4,166,812
Foreign Government Obligations
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	226,860	228,214
Available for sale securities, gross unrealized gains	7,573	13,171
Available for sale securities, gross unrealized losses	(4,159)	(2,025)
Available for sale securities, fair value	230,274	239,360
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	28,483,138	28,127,653
Available for sale securities, gross unrealized gains	727,105	1,897,005
Available for sale securities, gross unrealized losses	(838,729)	(145,687)
Available for sale securities, fair value	28,371,514	29,878,971
Held for investment, amortized cost		77,041
Held for investment, gross unrealized gains		0
Held for investment, gross unrealized losses		(581)
Held for investment, fair value		76,460
Residential Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	1,134,623	1,028,484
Available for sale securities, gross unrealized gains	71,661	79,554
Available for sale securities, gross unrealized losses	(4,125)	(2,471)
Available for sale securities, fair value	1,202,159	1,105,567
Commercial Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	5,492,271	5,531,922
Available for sale securities, gross unrealized gains	21,558	82,768
Available for sale securities, gross unrealized losses	(134,826)	(69,840)
Available for sale securities, fair value	5,379,003	5,544,850
Other Asset Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	5,693,255	3,075,975
Available for sale securities, gross unrealized gains	41,308	57,966
Available for sale securities, gross unrealized losses	(270,234)	(13,405)
Available for sale securities, fair value	$ 5,464,329	3,120,536
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale equity securities, amortized cost		292,429
Available for sale equity securities, gross unrealized gains		0
Available for sale equity securities, gross unrealized losses		0
Available for sale equity securities, fair value		$ 292,429

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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