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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,986 | $ 76,825
Held for investment | 75,046 | 68,766
Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 42,486,275 | 39,953,955
Available for sale, gross unrealized gains | 2,393,616 | 1,691,257
Available for sale, gross unrealized losses | (278,594) | (584,718)
Available for sale, fair value | 44,601,297 | 41,060,494
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 11,864 | 11,864
Available for sale, gross unrealized gains | 210 | 229
Available for sale, gross unrealized losses | (139) | (288)
Available for sale, fair value | 11,935 | 11,805
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,306,423 | 1,368,340
Available for sale, gross unrealized gains | 29,350 | 23,360
Available for sale, gross unrealized losses | (33,698) | (46,913)
Available for sale, fair value | 1,302,075 | 1,344,787
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 3,737,212 | 3,626,395
Available for sale, gross unrealized gains | 362,914 | 322,948
Available for sale, gross unrealized losses | (6,494) | (22,393)
Available for sale, fair value | 4,093,632 | 3,926,950
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 228,291 | 229,589
Available for sale, gross unrealized gains | 13,821 | 11,832
Available for sale, gross unrealized losses | (1,712) | (5,080)
Available for sale, fair value | 240,400 | 236,341
Fixed Maturity Securities [Member] | Corporate Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 28,071,650 | 26,333,213
Available for sale, gross unrealized gains | 1,755,592 | 1,149,978
Available for sale, gross unrealized losses | (151,318) | (368,773)
Available for sale, fair value | 29,675,924 | 27,114,418
Held for investment, amortized cost | 76,986 | 76,825
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (1,940) | (8,059)
Held for investment | 75,046 | 68,766
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,060,247 | 1,166,944
Available for sale, gross unrealized gains | 88,841 | 91,445
Available for sale, gross unrealized losses | (2,266) | (3,554)
Available for sale, fair value | 1,146,822 | 1,254,835
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 5,510,057 | 5,422,255
Available for sale, gross unrealized gains | 90,743 | 59,994
Available for sale, gross unrealized losses | (68,317) | (117,014)
Available for sale, fair value | 5,532,483 | 5,365,235
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 2,560,531 | 1,795,355
Available for sale, gross unrealized gains | 52,145 | 31,471
Available for sale, gross unrealized losses | (14,650) | (20,703)
Available for sale, fair value | 2,598,026 | 1,806,123
Equity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 7,427 | 7,521
Available for sale, gross unrealized gains | 0 | 479
Available for sale, gross unrealized losses | 0 | 0
Available for sale, fair value | $ 7,427 | $ 8,000

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