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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 76,722	$ 76,622
Held for investment	68,542	65,377
Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	36,982,728	35,823,710
Available for sale, gross unrealized gains	3,157,716	1,443,474
Available for sale, gross unrealized losses	(276,641)	(845,345)
Available for sale, fair value	39,863,803	36,421,839
Equity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	7,518	7,515
Available for sale, gross unrealized gains	295	313
Available for sale, gross unrealized losses	0	0
Available for sale, fair value	7,813	7,828
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	446,560	470,567
Available for sale, gross unrealized gains	2,879	988
Available for sale, gross unrealized losses	0	(299)
Available for sale, fair value	449,439	471,256
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,319,088	1,386,219
Available for sale, gross unrealized gains	61,728	26,801
Available for sale, gross unrealized losses	(550)	(14,409)
Available for sale, fair value	1,380,266	1,398,611
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	3,459,913	3,422,667
Available for sale, gross unrealized gains	516,314	341,328
Available for sale, gross unrealized losses	(683)	(8,628)
Available for sale, fair value	3,975,544	3,755,367
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	234,382	210,953
Available for sale, gross unrealized gains	25,063	12,547
Available for sale, gross unrealized losses	(5,455)	(10,935)
Available for sale, fair value	253,990	212,565
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	24,393,498	23,597,530
Available for sale, gross unrealized gains	2,201,998	887,288
Available for sale, gross unrealized losses	(212,380)	(682,424)
Available for sale, fair value	26,383,116	23,802,394
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment Securities [Member]
Investment Holdings [Line Items]
Held for investment, amortized cost	76,722	76,622
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(8,180)	(11,245)
Held for investment	68,542	65,377
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,257,634	1,366,985
Available for sale, gross unrealized gains	136,085	98,576
Available for sale, gross unrealized losses	(1,278)	(3,489)
Available for sale, fair value	1,392,441	1,462,072
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	4,600,531	4,238,265
Available for sale, gross unrealized gains	173,501	41,412
Available for sale, gross unrealized losses	(38,822)	(105,281)
Available for sale, fair value	4,735,210	4,174,396
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	1,271,122	1,130,524
Available for sale, gross unrealized gains	40,148	34,534
Available for sale, gross unrealized losses	(17,473)	(19,880)
Available for sale, fair value	$ 1,293,797	$ 1,145,178

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