Related-Party Transactions (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceded written premiums		$ 646,001	$ 664,316	$ 1,713,502	$ 1,706,390
Ceded earned premiums		591,656	598,641	1,708,807	1,613,741
Ceded losses and LAE	[1]	343,660	344,513	984,371	879,336
Everest International [Member]
Related Party Transaction [Line Items]
Ceded written premiums		168	131	313	219
Ceded earned premiums		208	176	441	450
Ceded losses and LAE		(724)	(321)	156	1,823
Everest Canada [Member]
Related Party Transaction [Line Items]
Assumed written premiums		11,046	10,425	29,533	25,650
Assumed earned premiums		9,174	7,106	26,498	17,062
Assumed losses and LAE		4,041	4,104	15,062	10,487
Mt. Logan Re [Member]
Related Party Transaction [Line Items]
Ceded written premiums		68,078	44,728	162,640	93,322
Ceded earned premiums		55,234	38,458	141,668	78,975
Ceded losses and LAE		17,071	3,113	38,542	17,904
Assumed written premiums		4,230	578	11,626	10,497
Assumed earned premiums		$ 4,230	$ 5,786	$ 11,626	$ 10,497
Assumed losses and LAE

[1] (a) Ceded losses and LAE include the Mt. McKinley loss portfolio transfer that constitutes losses ceded under retroactive reinsurance and therefore, in accordance with FASB guidance, amortization of deferred gain on retroactive reinsurance is reflected in other income on the consolidated statements of operations and comprehensive income (loss). Upon the sale of Mt. McKinley, the value of the remaining deferred gain on retroactive reinsurance was included in the calculation of the realized gain on sale of subsidiary.