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Schedule I. Summary of Investments Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Fair Value | $ 9,503,439
Amount at which shown in the Balance Sheet | 9,503,439
U.S. treasuries |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 3,195,767
Fair Value | 3,168,763
Amount at which shown in the Balance Sheet | 3,168,763
Agencies |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 48,151
Fair Value | 47,646
Amount at which shown in the Balance Sheet | 47,646
Municipal |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 506,486
Fair Value | 509,802
Amount at which shown in the Balance Sheet | 509,802
Non-U.S. government (Sovereign debt) |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 287,641
Fair Value | 287,660
Amount at which shown in the Balance Sheet | 287,660
Non-U.S. government-backed corporate |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 164,312
Fair Value | 163,651
Amount at which shown in the Balance Sheet | 163,651
Corporate |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 2,057,219
Fair Value | 2,063,459
Amount at which shown in the Balance Sheet | 2,063,459
Agency mortgage-backed |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 507,250
Fair Value | 500,456
Amount at which shown in the Balance Sheet | 500,456
Non-agency mortgage-backed |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 283,303
Fair Value | 300,331
Amount at which shown in the Balance Sheet | 300,331
Commercial mortgage-backed |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 202,452
Fair Value | 202,062
Amount at which shown in the Balance Sheet | 202,062
Asset-backed |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 182,289
Fair Value | 182,725
Amount at which shown in the Balance Sheet | 182,725
Fixed maturity investments |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost or Cost | 7,434,870
Fair Value | 7,426,555
Amount at which shown in the Balance Sheet | 7,426,555
Short term investments |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Fair Value | 991,863
Amount at which shown in the Balance Sheet | 991,863
Equity investments |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Fair Value | 388,254
Amount at which shown in the Balance Sheet | 388,254
Other investments |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Fair Value | 594,793
Amount at which shown in the Balance Sheet | 594,793
Investments in other ventures, under equity method |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Fair Value | 101,974
Amount at which shown in the Balance Sheet | $ 101,974

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- Definition This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010 + Details
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- Definition This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010 + Details
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- Definition This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010 + Details
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