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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 76,931	$ 76,825
Held for investment	76,702	68,766
Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	41,907,744	39,953,955
Available for sale, gross unrealized gains	2,304,286	1,691,257
Available for sale, gross unrealized losses	(318,245)	(584,718)
Available for sale, fair value	43,893,785	41,060,494
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	12,114	11,864
Available for sale, gross unrealized gains	228	229
Available for sale, gross unrealized losses	(168)	(288)
Available for sale, fair value	12,174	11,805
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,348,391	1,368,340
Available for sale, gross unrealized gains	30,288	23,360
Available for sale, gross unrealized losses	(37,840)	(46,913)
Available for sale, fair value	1,340,839	1,344,787
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	3,777,760	3,626,395
Available for sale, gross unrealized gains	369,526	322,948
Available for sale, gross unrealized losses	(9,572)	(22,393)
Available for sale, fair value	4,137,714	3,926,950
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	228,896	229,589
Available for sale, gross unrealized gains	12,462	11,832
Available for sale, gross unrealized losses	(2,489)	(5,080)
Available for sale, fair value	238,869	236,341
Fixed Maturity Securities [Member] | Corporate Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	27,813,420	26,333,213
Available for sale, gross unrealized gains	1,656,805	1,149,978
Available for sale, gross unrealized losses	(183,154)	(368,773)
Available for sale, fair value	29,287,071	27,114,418
Held for investment, amortized cost	76,931	76,825
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(229)	(8,059)
Held for investment	76,702	68,766
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,090,846	1,166,944
Available for sale, gross unrealized gains	93,316	91,445
Available for sale, gross unrealized losses	(2,312)	(3,554)
Available for sale, fair value	1,181,850	1,254,835
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	5,519,767	5,422,255
Available for sale, gross unrealized gains	89,865	59,994
Available for sale, gross unrealized losses	(69,249)	(117,014)
Available for sale, fair value	5,540,383	5,365,235
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	2,116,550	1,795,355
Available for sale, gross unrealized gains	51,796	31,471
Available for sale, gross unrealized losses	(13,461)	(20,703)
Available for sale, fair value	2,154,885	1,806,123
Equity Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	7,525	7,521
Available for sale, gross unrealized gains	457	479
Available for sale, gross unrealized losses	0	0
Available for sale, fair value	$ 7,982	$ 8,000

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