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Investments (Schedule of Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,622 | $ 76,432
Held for investment, fair value | 65,377 | 75,838
Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 35,823,710 | 30,205,046
Available for sale securities, gross unrealized gains | 1,443,474 | 2,395,577
Available for sale securities, gross unrealized losses | (845,345) | (155,421)
Available for sale securities, fair value | 36,421,839 | 32,445,202
Equity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 7,515 | 7,509
Available for sale securities, gross unrealized gains | 313 | 296
Available for sale securities, gross unrealized losses | 0 | 0
Available for sale securities, fair value | 7,828 | 7,805
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 470,567 | 137,710
Available for sale securities, gross unrealized gains | 988 | 765
Available for sale securities, gross unrealized losses | (299) | (15)
Available for sale securities, fair value | 471,256 | 138,460
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,386,219 | 1,364,424
Available for sale securities, gross unrealized gains | 26,801 | 43,399
Available for sale securities, gross unrealized losses | (14,409) | (13,933)
Available for sale securities, fair value | 1,398,611 | 1,393,890
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 3,422,667 | 3,293,551
Available for sale securities, gross unrealized gains | 341,328 | 430,469
Available for sale securities, gross unrealized losses | (8,628) | (711)
Available for sale securities, fair value | 3,755,367 | 3,723,309
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 210,953 | 181,128
Available for sale securities, gross unrealized gains | 12,547 | 16,628
Available for sale securities, gross unrealized losses | (10,935) | (3,953)
Available for sale securities, fair value | 212,565 | 193,803
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 23,597,530 | 19,984,747
Available for sale securities, gross unrealized gains | 887,288 | 1,628,941
Available for sale securities, gross unrealized losses | (682,424) | (123,396)
Available for sale securities, fair value | 23,802,394 | 21,490,292
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment [Member] |  |
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | 76,622 | 76,432
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (11,245) | (594)
Held for investment, fair value | 65,377 | 75,838
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,366,985 | 1,616,846
Available for sale securities, gross unrealized gains | 98,576 | 136,704
Available for sale securities, gross unrealized losses | (3,489) | (2,205)
Available for sale securities, fair value | 1,462,072 | 1,751,345
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 4,238,265 | 2,720,294
Available for sale securities, gross unrealized gains | 41,412 | 90,649
Available for sale securities, gross unrealized losses | (105,281) | (3,323)
Available for sale securities, fair value | 4,174,396 | 2,807,620
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,130,524 | 906,346
Available for sale securities, gross unrealized gains | 34,534 | 48,022
Available for sale securities, gross unrealized losses | (19,880) | (7,885)
Available for sale securities, fair value | $ 1,145,178 | $ 946,483

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