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Investments (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |
Additional contractual commitments | $ 1,501,536,000 | $ 1,501,536,000 |
Contractual commitments, investment period expiration date | Jan. 01, 2026 |  |
Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Aggregate market value of investments in unrealized loss position | $ 2,798,094,000 | 2,798,094,000 | $ 3,639,991,000
Gross unrealized losses on investments in unrealized loss position | 169,387,000 | 169,387,000 | 121,169,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 68,531,000 | 68,531,000 | 26,793,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 100,856,000 | 100,856,000 | 94,376,000
Market value of investments | 17,055,259,000 | $ 17,055,259,000 | $ 16,824,944,000
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 |  | 0.10% | 0.80%
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 | 43,605,000 | $ 43,605,000 | $ 23,104,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 68,587,000 | 68,587,000 | 73,144,000
Sub-prime and Alt-A Loans [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized depreciation | 0 | 0 | $ 0
Private Placement Liquidity Sweep [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Market value of investments | $ 586,104,000 | $ 586,104,000 |

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