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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | $ 41,852,088 |  | $ 42,304,736 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 4,917,555 |  | 5,549,754 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (96,197) |  | (250,826) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (14,190) | $ (59,698) | (64,771) | $ (50,186) | $ (28,332) | $ 0
Fixed maturity securities, available for sale, fair value |  | 46,659,256 |  | 47,538,893 |  |  |
Accrued interest receivable |  | 374,100 |  | 377,500 |  |  |
United States Government Full Faith and Credit |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 37,274 |  | 37,471 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 1,626 |  | 2,300 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (21) |  | 0 |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, fair value |  | 38,879 |  | 39,771 |  |  |
United States Government Sponsored Agencies |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 1,009,042 |  | 995,465 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 37,144 |  | 44,132 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | 0 |  | (46) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, fair value |  | 1,046,186 |  | 1,039,551 |  |  |
United States Municipalities, States and Territories |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 3,219,847 |  | 3,236,767 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 485,025 |  | 543,252 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (1,300) |  | (1,044) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (3,347) | (2,791) | (2,844) | 0 | 0 | 0
Fixed maturity securities, available for sale, fair value |  | 3,700,225 |  | 3,776,131 |  |  |
Foreign Government Obligations |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 177,087 |  | 177,062 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 20,243 |  | 25,644 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, fair value |  | 197,330 |  | 202,706 |  |  |
Corporate Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 27,525,768 |  | 26,745,196 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 3,957,107 |  | 4,507,716 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (16,335) |  | (35,892) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (10,723) | (55,715) | (60,193) | (46,749) | (28,332) | 0
Fixed maturity securities, available for sale, fair value |  | 31,455,817 |  | 31,156,827 |  |  |
Residential Mortgage Backed Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 1,106,921 |  | 1,399,956 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 88,133 |  | 117,135 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (2,511) |  | (2,526) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (120) | (1,192) | (1,734) | (777) | 0 | 0
Fixed maturity securities, available for sale, fair value |  | 1,192,423 |  | 1,512,831 |  |  |
Commercial Mortgage Backed Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 3,977,815 |  | 4,119,650 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 223,453 |  | 206,255 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (25,751) |  | (64,678) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 | 0 | (2,660) | 0 | 0
Fixed maturity securities, available for sale, fair value |  | 4,175,517 |  | 4,261,227 |  |  |
Other Asset Backed Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 4,798,334 |  | 5,593,169 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 104,824 |  | 103,320 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (50,279) |  | (146,640) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0
Fixed maturity securities, available for sale, fair value |  | $ 4,852,879 |  | $ 5,549,849 |  |  |
[1] | Amortized cost excludes accrued interest receivable of $374.1 million and $377.5 million as of June 30, 2021 and December 31, 2020, respectively.
[2] | Gross unrealized losses are net of allowance for credit losses.

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