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Schedule I. Summary of Investments Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | $ 17,368,789
Amount at which shown in the Balance Sheet | 17,368,789
U.S. treasuries |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 4,439,533
Fair Value | 4,467,345
Amount at which shown in the Balance Sheet | 4,467,345
Agencies |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 342,162
Fair Value | 343,031
Amount at which shown in the Balance Sheet | 343,031
Non-U.S. government |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 495,465
Fair Value | 497,392
Amount at which shown in the Balance Sheet | 497,392
Non-U.S. government-backed corporate |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 321,303
Fair Value | 321,356
Amount at which shown in the Balance Sheet | 321,356
Corporate |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 3,010,615
Fair Value | 3,075,660
Amount at which shown in the Balance Sheet | 3,075,660
Agency mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 1,130,746
Fair Value | 1,148,499
Amount at which shown in the Balance Sheet | 1,148,499
Non-agency mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 282,267
Fair Value | 294,604
Amount at which shown in the Balance Sheet | 294,604
Commercial mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 489,352
Fair Value | 468,698
Amount at which shown in the Balance Sheet | 468,698
Asset-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 555,971
Fair Value | 555,070
Amount at which shown in the Balance Sheet | 555,070
Fixed maturity investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 11,067,414
Fair Value | 11,171,655
Amount at which shown in the Balance Sheet | 11,171,655
Short term investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 4,566,277
Amount at which shown in the Balance Sheet | 4,566,277
Equity investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 436,931
Amount at which shown in the Balance Sheet | 436,931
Other investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 1,087,377
Amount at which shown in the Balance Sheet | 1,087,377
Investments in other ventures, under equity method |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 106,549
Amount at which shown in the Balance Sheet | $ 106,549

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