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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,773 | $ 76,622
Held for investment | 75,547 | 65,377
Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 39,199,077 | 35,823,710
Available for sale, gross unrealized gains | 3,288,979 | 1,443,474
Available for sale, gross unrealized losses | (183,646) | (845,345)
Available for sale, fair value | 42,304,410 | 36,421,839
Equity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 7,520 | 7,515
Available for sale, gross unrealized gains | 323 | 313
Available for sale, gross unrealized losses | 0 | 0
Available for sale, fair value | 7,843 | 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 | 416,503 | 470,567
Available for sale, gross unrealized gains | 1,962 | 988
Available for sale, gross unrealized losses | 0 | (299)
Available for sale, fair value | 418,465 | 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 | 1,410,760 | 1,386,219
Available for sale, gross unrealized gains | 62,563 | 26,801
Available for sale, gross unrealized losses | (419) | (14,409)
Available for sale, fair value | 1,472,904 | 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 | 3,548,586 | 3,422,667
Available for sale, gross unrealized gains | 503,992 | 341,328
Available for sale, gross unrealized losses | (368) | (8,628)
Available for sale, fair value | 4,052,210 | 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 | 233,825 | 210,953
Available for sale, gross unrealized gains | 24,420 | 12,547
Available for sale, gross unrealized losses | (3,825) | (10,935)
Available for sale, fair value | 254,420 | 212,565
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 25,751,501 | 23,597,530
Available for sale, gross unrealized gains | 2,298,306 | 887,288
Available for sale, gross unrealized losses | (134,150) | (682,424)
Available for sale, fair value | 27,915,657 | 23,802,394
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment Securities [Member] |  |
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | 76,773 | 76,622
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (1,226) | (11,245)
Held for investment | 75,547 | 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 | 1,225,720 | 1,366,985
Available for sale, gross unrealized gains | 134,685 | 98,576
Available for sale, gross unrealized losses | (2,231) | (3,489)
Available for sale, fair value | 1,358,174 | 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 | 5,121,361 | 4,238,265
Available for sale, gross unrealized gains | 216,346 | 41,412
Available for sale, gross unrealized losses | (27,551) | (105,281)
Available for sale, fair value | 5,310,156 | 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 | 1,490,821 | 1,130,524
Available for sale, gross unrealized gains | 46,705 | 34,534
Available for sale, gross unrealized losses | (15,102) | (19,880)
Available for sale, fair value | $ 1,522,424 | $ 1,145,178

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