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Investments (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Percentage threshold that triggers a review of available for sale debt securities for declines in market value |  | 80.00% |  |
Aggregate market value of investments in unrealized loss position |  | $ 4,600,542,000 | $ 9,814,849,000 |
Gross unrealized losses on investments in unrealized loss position |  | 144,892,000 | 367,898,000 |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation |  | 21,807,000 | 120,838,000 |
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation |  | 123,085,000 | 247,060,000 |
Gross unrealized depreciation |  | 0 |  |
Additional contractual commitments |  | $ 823,622,000 |  |
Contractual commitments, investment period expiration date |  | Jan. 01, 2023 |  |
Reclassification of other invested assets to fixed maturity securities | $ 143,656,000 |  |  |
Reclassification of other invested assets to short-term investments | $ 243,864,000 |  |  |
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Aggregate market value of investments in unrealized loss position |  | $ 4,600,542,000 | 9,814,849,000 |
Gross unrealized losses on investments in unrealized loss position |  | 144,892,000 | 367,898,000 |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation |  | 21,807,000 | 120,838,000 |
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation |  | 123,085,000 | $ 247,060,000 |
Market value of investments |  | $ 15,804,524,000 |  | $ 15,225,263,000
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Percentage threshold that triggers a review of available for sale debt securities for declines in market value |  |  | 1.00% |
Fixed Maturity Securities [Member] | US Government Securities [Member] | Sales Revenue, Net [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Percentage threshold that triggers a review of available for sale debt securities for declines in market value |  |  | 5.70% |
Percentage threshold of unrealized losses not exceeded by any one single issuer |  | 0.90% |  |
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 |  | $ 12,934,000 | $ 74,729,000 |
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation |  | 106,852,000 | 230,560,000 |
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 |  | $ 717,083,000 |  |

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