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Schedule II. Condensed Financial Information Of Registrant (Balance Sheets) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Condensed Financial Statements, Captions [Line Items] |  |  |  |
Preference Shares, Par Value (In dollars per share) | $ 1 us-gaap_PreferredStockParOrStatedValuePerShare | $ 1 us-gaap_PreferredStockParOrStatedValuePerShare |  |
Assets |  |  |  |
Short-term investments | $ 1,013,222 us-gaap_OtherShortTermInvestments | $ 1,044,779 us-gaap_OtherShortTermInvestments |  |
Cash and cash equivalents | 525,584 us-gaap_CashAndCashEquivalentsAtCarryingValue | 408,032 us-gaap_CashAndCashEquivalentsAtCarryingValue | 304,145 us-gaap_CashAndCashEquivalentsAtCarryingValue | 181,825 us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments in subsidiaries | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |
Accrued investment income | 26,509 us-gaap_AccruedInvestmentIncomeReceivable | 34,065 us-gaap_AccruedInvestmentIncomeReceivable |  |
Receivable for investments sold | 52,390 us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations | 75,845 us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations |  |
Other assets | 135,845 us-gaap_OtherAssets | 108,438 us-gaap_OtherAssets |  |
Total assets | 8,203,550 us-gaap_Assets | 8,179,131 us-gaap_Assets |  |
Liabilities |  |  |  |
Contributions due to subsidiaries | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent |  |
Other liabilities | 374,108 us-gaap_OtherLiabilities | 397,596 us-gaap_OtherLiabilities |  |
Total liabilities | 3,206,127 us-gaap_Liabilities | 3,174,887 us-gaap_Liabilities |  |
Shareholders' Equity |  |  |  |
Preference shares: $1.00 par value – 16,000,000 shares issued and outstanding at December 31, 2014 (December 31, 2013 – 16,000,000) | 400,000 us-gaap_PreferredStockValue | 400,000 us-gaap_PreferredStockValue |  |
Common shares: $1.00 par value – 38,441,972 shares issued and outstanding at December 31, 2014 (December 31, 2013 – 43,646,436) | 38,442 us-gaap_CommonStockValue | 43,646 us-gaap_CommonStockValue |  |
Accumulated other comprehensive income | 3,416 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 4,131 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 13,622 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Retained earnings | 3,423,857 us-gaap_RetainedEarningsAccumulatedDeficit | 3,456,607 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Total shareholders’ equity | 3,865,715 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 3,904,384 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 3,507,056 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
Total liabilities, noncontrolling interests and shareholders’ equity | 8,203,550 us-gaap_LiabilitiesAndStockholdersEquity | 8,179,131 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Preference Shares, Par Value (In dollars per share) | $ 1.00 us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1.00 us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Assets |  |  |  |
Short-term investments | 137,006 us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 210,719 us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash and cash equivalents | 5,986 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,796 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,298 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,606 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investments in subsidiaries | 3,509,974 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,294,729 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Due from subsidiaries | 10,164 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,479 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Dividends due from subsidiaries | 116,384 us-gaap_DividendsReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 280,273 us-gaap_DividendsReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued investment income | 0 us-gaap_AccruedInvestmentIncomeReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_AccruedInvestmentIncomeReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Receivable for investments sold | 10 us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14 us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 112,400 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 112,234 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 3,891,924 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,923,244 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities |  |  |  |
Contributions due to subsidiaries | 6,000 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities | 20,209 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18,860 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 26,209 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18,860 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Shareholders' Equity |  |  |  |
Preference shares: $1.00 par value – 16,000,000 shares issued and outstanding at December 31, 2014 (December 31, 2013 – 16,000,000) | 400,000 us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 400,000 us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common shares: $1.00 par value – 38,441,972 shares issued and outstanding at December 31, 2014 (December 31, 2013 – 43,646,436) | 38,442 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 43,646 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive income | 3,416 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,131 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 3,423,857 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,456,607 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total shareholders’ equity | 3,865,715 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,904,384 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities, noncontrolling interests and shareholders’ equity | $ 3,891,924 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 3,923,244 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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