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v3.19.1

Investments (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018 | Dec. 31, 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 | $ 7,719,536,000 |  | $ 9,814,849,000
Gross unrealized losses on investments in unrealized loss position | 195,377,000 |  | 367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 28,026,000 |  | 120,838,000
Gross unrealized depreciation | 0 |  |
Additional contractual commitments | $ 797,896,000 |  |
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 | $ 7,719,536,000 |  | 9,814,849,000
Gross unrealized losses on investments in unrealized loss position | 195,377,000 |  | 367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 28,026,000 |  | 120,838,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 167,351,000 |  | 247,060,000
Market value of investments | $ 15,513,287,000 |  | $ 15,225,263,000
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 |  |  | 1.00%
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member] | US Government Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Percentage threshold of unrealized losses not exceeded by any one single issuer | 0.90% |  | 5.70%
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 | $ 13,333,000 |  | $ 230,560,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 153,285,000 |  | 74,729,000
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 | $ 507,584,000 |  |

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