Related-Party Transactions (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceded written premiums		$ 685,798	$ 646,001	$ 1,746,976	$ 1,713,502
Ceded earned premiums		585,993	591,656	1,718,295	1,708,807
Ceded losses and LAE	[1]	344,789	343,660	1,039,932	984,371
Everest International [Member]
Related Party Transaction [Line Items]
Ceded written premiums		(5)	168	26	313
Ceded earned premiums		(3)	208	36	441
Ceded losses and LAE		479	(724)	1,377	156
Everest Canada [Member]
Related Party Transaction [Line Items]
Assumed written premiums		12,667	11,046	39,094	29,533
Assumed earned premiums		11,611	9,174	34,740	26,498
Assumed losses and LAE		13,287	4,041	34,714	15,062
Lloyd's Syndicate [Member]
Related Party Transaction [Line Items]
Assumed written premiums		351		890
Assumed earned premiums		173		289
Mt. Logan Re Segregated Accounts [Member]
Related Party Transaction [Line Items]
Ceded written premiums		57,911	68,078	128,292	162,640
Ceded earned premiums		44,548	55,234	118,776	141,668
Ceded losses and LAE		7,420	17,071	32,750	38,542
Assumed written premiums		5,032	4,230	11,666	11,626
Assumed earned premiums		$ 5,032	$ 4,230	$ 11,666	11,626
Assumed losses and LAE

[1] 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.