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Investments (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |
Additional contractual commitments |  | $ 1,594,446,000 |
Contractual commitments, investment period expiration date |  | Dec. 31, 2026 |
Reclassification of other invested assets to fixed maturity securities | $ 143,656,000 |  |
Reclassification of other invested assets to short-term investments | $ 243,864,000 |  |
Securities, carrying value |  | $ 1,617,928,000 |
Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Aggregate market value of investments in unrealized loss position |  | 2,678,449,000 | $ 3,639,991,000
Gross unrealized losses on investments in unrealized loss position |  | 124,812,000 | 121,169,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation |  | 67,958,000 | 26,793,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation |  | 56,854,000 | 94,376,000
Market value of investments |  | $ 20,040,173,000 | $ 16,824,944,000
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Percentage threshold of unrealized losses not exceeded by any one single issuer |  | 0.10% | 0.80%
Fixed Maturity Securities [Member] | US Government Securities [Member] | Sales Revenue, Net [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Percentage threshold of unrealized losses not exceeded by any one single issuer |  | 0.70% |
Investment Grade [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation |  | $ 63,424,000 | $ 23,104,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation |  | 33,533,000 | 73,144,000
Sub-prime and Alt-A Loans [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized depreciation |  | 0 | $ 0
Private Placement Liquidity Sweep [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Market value of investments |  | $ 627,958,000 |

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