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Schedule I. Summary of Investments Other Than Investments in Related Parties (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Market Value	$ 8,999,068
Amount at which shown in the Balance Sheet	8,999,068
Other investments	481,621	$ 504,147
U.S. treasuries
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	2,071,287
Market Value	2,064,944
Amount at which shown in the Balance Sheet	2,064,944
Agencies
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	138,724
Market Value	137,976
Amount at which shown in the Balance Sheet	137,976
Municipal
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	580,670
Market Value	583,282
Amount at which shown in the Balance Sheet	583,282
Non-U.S. government (Sovereign Debt)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	344,901
Market Value	334,981
Amount at which shown in the Balance Sheet	334,981
Non-U.S. government-backed corporate
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	142,715
Market Value	138,994
Amount at which shown in the Balance Sheet	138,994
Corporate
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	2,100,277
Market Value	2,055,323
Amount at which shown in the Balance Sheet	2,055,323
Agency mortgage-backed
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	508,283
Market Value	504,518
Amount at which shown in the Balance Sheet	504,518
Non-agency mortgage-backed
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	258,851
Market Value	270,763
Amount at which shown in the Balance Sheet	270,763
Commercial mortgage-backed
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	565,060
Market Value	561,496
Amount at which shown in the Balance Sheet	561,496
Asset-backed
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	131,052
Market Value	130,541
Amount at which shown in the Balance Sheet	130,541
Fixed maturity investments
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	6,841,820
Market Value	6,782,818
Amount at which shown in the Balance Sheet	6,782,818
Short term investments
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Market Value	1,208,401
Amount at which shown in the Balance Sheet	1,208,401
Equity investments
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Market Value	393,877
Amount at which shown in the Balance Sheet	393,877
Other investments
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Market Value	481,621
Amount at which shown in the Balance Sheet	481,621
Investments in other ventures
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Market Value	132,351
Amount at which shown in the Balance Sheet	$ 132,351

X

- Definition

Other investments not otherwise specified in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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X

- Definition

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+ 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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+ 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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+ 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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