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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Held for investment, amortized cost	$ 76,672	$ 76,622
Held for investment	67,672	65,377
Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	36,696,786	35,823,710
Available for sale, gross unrealized gains	2,254,517	1,443,474
Available for sale, gross unrealized losses	(541,303)	(845,345)
Available for sale, fair value	38,410,000	36,421,839
Equity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	7,517	7,515
Available for sale, gross unrealized gains	296	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	469,957	470,567
Available for sale, gross unrealized gains	3,505	988
Available for sale, gross unrealized losses	(60)	(299)
Available for sale, fair value	473,402	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	1,519,674	1,386,219
Available for sale, gross unrealized gains	46,980	26,801
Available for sale, gross unrealized losses	(367)	(14,409)
Available for sale, fair value	1,566,287	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	3,448,482	3,422,667
Available for sale, gross unrealized gains	437,336	341,328
Available for sale, gross unrealized losses	(2,081)	(8,628)
Available for sale, fair value	3,883,737	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	210,964	210,953
Available for sale, gross unrealized gains	18,429	12,547
Available for sale, gross unrealized losses	(7,532)	(10,935)
Available for sale, fair value	221,861	212,565
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member]
Investment Holdings [Line Items]
Available for sale, amortized cost	24,113,794	23,597,530
Available for sale, gross unrealized gains	1,490,814	887,288
Available for sale, gross unrealized losses	(436,140)	(682,424)
Available for sale, fair value	25,168,468	23,802,394
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment Securities [Member]
Investment Holdings [Line Items]
Held for investment, amortized cost	76,672	76,622
Held for investment, gross unrealized gains	0	0
Held for investment, gross unrealized losses	(9,000)	(11,245)
Held for investment	67,672	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	1,313,775	1,366,985
Available for sale, gross unrealized gains	120,977	98,576
Available for sale, gross unrealized losses	(2,399)	(3,489)
Available for sale, fair value	1,432,353	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	4,472,852	4,238,265
Available for sale, gross unrealized gains	102,466	41,412
Available for sale, gross unrealized losses	(72,057)	(105,281)
Available for sale, fair value	4,503,261	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	1,147,288	1,130,524
Available for sale, gross unrealized gains	34,010	34,534
Available for sale, gross unrealized losses	(20,667)	(19,880)
Available for sale, fair value	$ 1,160,631	$ 1,145,178

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