Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Losses And LAE) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross reserves at January 1	$ 9,673,240	$ 10,069,055	$ 10,123,215
Less reinsurance recoverable	473,866us-gaap_ReinsuranceRecoverables	602,750us-gaap_ReinsuranceRecoverables	580,998us-gaap_ReinsuranceRecoverables	473,866us-gaap_ReinsuranceRecoverables
Net reserves at January 1	9,199,374	9,466,305	9,542,217
Incurred related to: Current year	2,946,396	2,818,490	2,748,925
Incurred related to: Prior years	(39,862)	(18,239)	(3,660)
Total incurred losses and LAE	2,906,534	2,800,251	2,745,265
Paid related to: Current year	761,788	664,719	633,894
Paid related to: Prior years	2,089,734	2,353,817	2,220,202
Total paid losses and LAE	2,851,522	3,018,536	2,854,096
Foreign exchange/translation adjustment	(160,655)	(48,646)	32,919
Net reserves at December 31	9,093,731	9,199,374	9,466,305
Plus reinsurance recoverable	627,082us-gaap_ReinsuranceRecoverables	473,866us-gaap_ReinsuranceRecoverables	602,750us-gaap_ReinsuranceRecoverables	473,866us-gaap_ReinsuranceRecoverables
Gross reserves at December 31	$ 9,720,813	$ 9,673,240	$ 10,069,055

Reserve For Losses And Loss Adjustment Expenses Net

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The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

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Total amount of payments made during the reporting period to settle insured claims and pay costs incurred in the claims settlement process.

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Amount of payments made in the reporting period to settle claims incurred in the current period and related claims settlement costs.

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Amount of payments made in the reporting period to settle claims incurred in prior periods and related claims settlement costs.

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Total provision in the period for claims incurred and costs incurred in the claim settlement process.

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Amount of provision in the period for claims incurred in the reporting period and related claims settlement costs.

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Amount of provision in the period for claims incurred in prior reporting periods and related claims settlement costs.

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Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Current period translation adjustment net of tax resulting from translating foreign currency financial statements into the reporting currency. Adjustment is reported in other comprehensive income and is not included in determining net income.

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