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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 77,041	$ 76,825
Held for investment, fair value	76,460	68,766
Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	43,116,759	39,953,955
Available for sale securities, gross unrealized gains	2,525,131	1,691,257
Available for sale securities, gross unrealized losses	(268,901)	(584,718)
Available for sale securities, fair value	45,372,989	41,060,494
Equity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	292,429	7,521
Available for sale securities, gross unrealized gains	0	479
Available for sale securities, gross unrealized losses	0	0
Available for sale securities, fair value	292,429	8,000
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	11,861	11,864
Available for sale securities, gross unrealized gains	162	229
Available for sale securities, gross unrealized losses	(147)	(288)
Available for sale securities, fair value	11,876	11,805
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	1,308,290	1,368,340
Available for sale securities, gross unrealized gains	28,457	23,360
Available for sale securities, gross unrealized losses	(31,730)	(46,913)
Available for sale securities, fair value	1,305,017	1,344,787
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	3,804,360	3,626,395
Available for sale securities, gross unrealized gains	366,048	322,948
Available for sale securities, gross unrealized losses	(3,596)	(22,393)
Available for sale securities, fair value	4,166,812	3,926,950
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	228,214	229,589
Available for sale securities, gross unrealized gains	13,171	11,832
Available for sale securities, gross unrealized losses	(2,025)	(5,080)
Available for sale securities, fair value	239,360	236,341
Corporate Securities [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	28,127,653	26,333,213
Available for sale securities, gross unrealized gains	1,897,005	1,149,978
Available for sale securities, gross unrealized losses	(145,687)	(368,773)
Available for sale securities, fair value	29,878,971	27,114,418
Held for investment, amortized cost	77,041	76,825
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(581)	(8,059)
Held for investment, fair value	76,460	68,766
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	1,028,484	1,166,944
Available for sale securities, gross unrealized gains	79,554	91,445
Available for sale securities, gross unrealized losses	(2,471)	(3,554)
Available for sale securities, fair value	1,105,567	1,254,835
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	5,531,922	5,422,255
Available for sale securities, gross unrealized gains	82,768	59,994
Available for sale securities, gross unrealized losses	(69,840)	(117,014)
Available for sale securities, fair value	5,544,850	5,365,235
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, amortized cost	3,075,975	1,795,355
Available for sale securities, gross unrealized gains	57,966	31,471
Available for sale securities, gross unrealized losses	(13,405)	(20,703)
Available for sale securities, fair value	$ 3,120,536	$ 1,806,123

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