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
Condensed Financial Statements, Captions [Line Items]
Preference Shares, Par Value (In dollars per share)	$ 1	$ 1
Assets
Short-term investments	$ 1,013,222us-gaap_OtherShortTermInvestments	$ 1,044,779us-gaap_OtherShortTermInvestments
Cash and cash equivalents	525,584	408,032	304,145	181,825
Investments in subsidiaries	0	0
Accrued investment income	26,509	34,065
Receivable for investments sold	52,390	75,845
Other assets	135,845us-gaap_OtherAssets	108,438us-gaap_OtherAssets
Total assets	8,203,550us-gaap_Assets	8,179,131us-gaap_Assets
Liabilities
Contributions due to subsidiaries	0	0
Other liabilities	374,108us-gaap_OtherLiabilities	397,596us-gaap_OtherLiabilities
Total liabilities	3,206,127us-gaap_Liabilities	3,174,887us-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)	400,000us-gaap_PreferredStockValue	400,000us-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)	38,442us-gaap_CommonStockValue	43,646us-gaap_CommonStockValue
Accumulated other comprehensive income	3,416	4,131	13,622
Retained earnings	3,423,857	3,456,607
Total shareholders’ equity	3,865,715	3,904,384	3,507,056
Total liabilities, noncontrolling interests and shareholders’ equity	8,203,550	8,179,131
Parent Company
Condensed Financial Statements, Captions [Line Items]
Preference Shares, Par Value (In dollars per share)	$ 1.00	$ 1.00
Assets
Short-term investments	137,006	210,719
Cash and cash equivalents	5,986	8,796	6,298	10,606
Investments in subsidiaries	3,509,974	3,294,729
Due from subsidiaries	10,164	16,479
Dividends due from subsidiaries	116,384	280,273
Accrued investment income	0	0
Receivable for investments sold	10	14
Other assets	112,400	112,234
Total assets	3,891,924	3,923,244
Liabilities
Contributions due to subsidiaries	6,000	0
Other liabilities	20,209	18,860
Total liabilities	26,209	18,860
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	400,000
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	43,646
Accumulated other comprehensive income	3,416	4,131
Retained earnings	3,423,857	3,456,607
Total shareholders’ equity	3,865,715	3,904,384
Total liabilities, noncontrolling interests and shareholders’ equity	$ 3,891,924	$ 3,923,244

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