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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 |

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- 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 + Details
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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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