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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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