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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 77,155 | $ 77,041
Held for investment | 68,108 | 76,460
Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 44,353,741 | 43,116,759
Available for sale, gross unrealized gains | 1,304,091 | 2,525,131
Available for sale, gross unrealized losses | (858,462) | (268,901)
Available for sale, fair value | 44,799,370 | 45,372,989
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 11,693 | 11,861
Available for sale, gross unrealized gains | 96 | 162
Available for sale, gross unrealized losses | (434) | (147)
Available for sale, fair value | 11,355 | 11,876
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,308,334 | 1,308,290
Available for sale, gross unrealized gains | 16,776 | 28,457
Available for sale, gross unrealized losses | (75,670) | (31,730)
Available for sale, fair value | 1,249,440 | 1,305,017
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 3,914,553 | 3,804,360
Available for sale, gross unrealized gains | 274,464 | 366,048
Available for sale, gross unrealized losses | (14,835) | (3,596)
Available for sale, fair value | 4,174,182 | 4,166,812
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 227,542 | 228,214
Available for sale, gross unrealized gains | 6,742 | 13,171
Available for sale, gross unrealized losses | (5,671) | (2,025)
Available for sale, fair value | 228,613 | 239,360
Fixed Maturity Securities [Member] | Corporate Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 28,015,515 | 28,127,653
Available for sale, gross unrealized gains | 868,904 | 1,897,005
Available for sale, gross unrealized losses | (611,887) | (145,687)
Available for sale, fair value | 28,272,532 | 29,878,971
Held for investment, amortized cost | 77,155 | 77,041
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (9,047) | (581)
Held for investment | 68,108 | 76,460
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,147,738 | 1,028,484
Available for sale, gross unrealized gains | 67,642 | 79,554
Available for sale, gross unrealized losses | (7,774) | (2,471)
Available for sale, fair value | 1,207,606 | 1,105,567
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 5,426,483 | 5,531,922
Available for sale, gross unrealized gains | 26,015 | 82,768
Available for sale, gross unrealized losses | (121,324) | (69,840)
Available for sale, fair value | 5,331,174 | 5,544,850
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 4,301,883 | 3,075,975
Available for sale, gross unrealized gains | 43,452 | 57,966
Available for sale, gross unrealized losses | (20,867) | (13,405)
Available for sale, fair value | $ 4,324,468 | 3,120,536
Equity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost |  | 292,429
Available for sale, gross unrealized gains |  | 0
Available for sale, gross unrealized losses |  | 0
Available for sale, fair value |  | $ 292,429

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