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Schedule I. Summary of Investments Other Than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2017 USD ($)
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

X

- 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

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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

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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

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No definition available.

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