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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,574 | $ 76,432
Held for investment | 62,000 | 75,838
Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 34,058,330 | 30,205,046
Available for sale, gross unrealized gains | 1,815,380 | 2,395,577
Available for sale, gross unrealized losses | (483,868) | (155,421)
Available for sale, fair value | 35,389,842 | 32,445,202
Equity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 7,514 | 7,509
Available for sale, gross unrealized gains | 319 | 296
Available for sale, gross unrealized losses | 0 | 0
Available for sale, fair value | 7,833 | 7,805
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 | 36,355 | 137,710
Available for sale, gross unrealized gains | 1,437 | 765
Available for sale, gross unrealized losses | (111) | (15)
Available for sale, fair value | 37,681 | 138,460
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,286,586 | 1,364,424
Available for sale, gross unrealized gains | 35,864 | 43,399
Available for sale, gross unrealized losses | (7,702) | (13,933)
Available for sale, fair value | 1,314,748 | 1,393,890
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 | 3,405,519 | 3,293,551
Available for sale, gross unrealized gains | 363,590 | 430,469
Available for sale, gross unrealized losses | (8,221) | (711)
Available for sale, fair value | 3,760,888 | 3,723,309
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 210,941 | 181,128
Available for sale, gross unrealized gains | 16,199 | 16,628
Available for sale, gross unrealized losses | (10,153) | (3,953)
Available for sale, fair value | 216,987 | 193,803
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 22,738,792 | 19,984,747
Available for sale, gross unrealized gains | 1,135,974 | 1,628,941
Available for sale, gross unrealized losses | (415,018) | (123,396)
Available for sale, fair value | 23,459,748 | 21,490,292
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment Securities [Member] |  |
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | 76,574 | 76,432
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (14,574) | (594)
Held for investment | 62,000 | 75,838
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,431,656 | 1,616,846
Available for sale, gross unrealized gains | 126,485 | 136,704
Available for sale, gross unrealized losses | (1,833) | (2,205)
Available for sale, fair value | 1,556,308 | 1,751,345
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 3,881,487 | 2,720,294
Available for sale, gross unrealized gains | 90,536 | 90,649
Available for sale, gross unrealized losses | (30,160) | (3,323)
Available for sale, fair value | 3,941,863 | 2,807,620
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,066,994 | 906,346
Available for sale, gross unrealized gains | 45,295 | 48,022
Available for sale, gross unrealized losses | (10,670) | (7,885)
Available for sale, fair value | $ 1,101,619 | $ 946,483

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