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Schedule I. Summary of Investments Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | $ 11,885,747
Amount at which shown in the Balance Sheet | 11,885,747
U.S. treasuries |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 3,336,969
Fair Value | 3,331,411
Amount at which shown in the Balance Sheet | 3,331,411
Agencies |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 175,185
Fair Value | 174,883
Amount at which shown in the Balance Sheet | 174,883
Municipal |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 6,070
Fair Value | 6,854
Amount at which shown in the Balance Sheet | 6,854
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 | 284,965
Fair Value | 279,818
Amount at which shown in the Balance Sheet | 279,818
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 | 160,286
Fair Value | 160,063
Amount at which shown in the Balance Sheet | 160,063
Corporate |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 2,513,434
Fair Value | 2,450,244
Amount at which shown in the Balance Sheet | 2,450,244
Agency mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 825,365
Fair Value | 817,880
Amount at which shown in the Balance Sheet | 817,880
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 | 266,705
Fair Value | 278,680
Amount at which shown in the Balance Sheet | 278,680
Commercial mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 284,495
Fair Value | 282,294
Amount at which shown in the Balance Sheet | 282,294
Asset-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 310,488
Fair Value | 306,743
Amount at which shown in the Balance Sheet | 306,743
Fixed maturity investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 8,163,962
Fair Value | 8,088,870
Amount at which shown in the Balance Sheet | 8,088,870
Short term investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 2,586,520
Amount at which shown in the Balance Sheet | 2,586,520
Equity investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 310,252
Amount at which shown in the Balance Sheet | 310,252
Other investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 784,933
Amount at which shown in the Balance Sheet | 784,933
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 | 115,172
Amount at which shown in the Balance Sheet | $ 115,172

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