Other Comprehensive Income (Loss) (Reclassified From Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	$ 21,126	$ 126,926
Other underwriting expenses	50,638	52,946
Income tax expense (benefit)	53,232	85,496
NET INCOME (LOSS) ATTRIBUTABLE TO EVEREST RE GROUP	293,933	384,343
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | URA(D) On Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	2,436	(4,919)
Income tax expense (benefit)	(562)	828
NET INCOME (LOSS) ATTRIBUTABLE TO EVEREST RE GROUP	1,874	(4,091)
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Benefit Plan Liabilities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses	1,186	2,070
Income tax expense (benefit)	(415)	(724)
NET INCOME (LOSS) ATTRIBUTABLE TO EVEREST RE GROUP	$ 771	$ 1,346