Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Common Shares [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss), Net Of Deferred Income Taxes [Member]	Retained Earnings [Member]	Treasury Shares At Cost [Member]	Total
Balance, beginning of period, shares at Dec. 31, 2013	47,543,132
Issued during the period, shares	315,139
Treasury shares acquired, shares	(2,167,256)
Balance, beginning of period at Dec. 31, 2013	$ 680	$ 2,029,774	$ 157,728	$ 6,765,967	$ (1,985,873)
Issued during the period, net	$ 3
Share-based compensation plans		22,908
Net increase (decrease) during the period			141,576			$ 141,576
Net income (loss) attributable to Everest Re Group				584,117		584,117
Dividends declared ($0.95 per share in second quarter2015 and $1.90 year-to-date per share in 2015 and $0.75 per share in second quarter 2014 and $1.50 year-to-date per share in 2014)				(69,061)		(69,061)
Purchase of treasury shares					(324,951)
Balance, end of period, shares at Jun. 30, 2014	45,691,015
Balance, end of period at Jun. 30, 2014	$ 683	2,052,682	299,304	7,281,023	(2,310,824)	7,322,868
Balance, beginning of period, shares at Mar. 31, 2014	46,057,039
Issued during the period, shares	109,068
Treasury shares acquired, shares	(475,092)
Balance, beginning of period at Mar. 31, 2014	$ 682	2,036,320	211,207	7,025,158	(2,235,856)
Issued during the period, net	$ 1
Share-based compensation plans		16,362
Net increase (decrease) during the period			88,097			88,097
Net income (loss) attributable to Everest Re Group				290,184		290,184
Dividends declared ($0.95 per share in second quarter2015 and $1.90 year-to-date per share in 2015 and $0.75 per share in second quarter 2014 and $1.50 year-to-date per share in 2014)				(34,319)		(34,319)
Purchase of treasury shares					(74,968)
Balance, end of period, shares at Jun. 30, 2014	45,691,015
Balance, end of period at Jun. 30, 2014	$ 683	2,052,682	299,304	7,281,023	(2,310,824)	$ 7,322,868
Balance, beginning of period, shares at Dec. 31, 2014	44,685,637					68,336,000
Issued during the period, shares	219,267
Treasury shares acquired, shares	(712,378)
Balance, beginning of period at Dec. 31, 2014	$ 683	2,068,807	48,317	7,819,210	(2,485,897)	$ 7,451,120
Issued during the period, net	$ 2
Share-based compensation plans		15,829
Net increase (decrease) during the period			(63,136)			(63,136)
Net income (loss) attributable to Everest Re Group				532,035		532,035
Dividends declared ($0.95 per share in second quarter2015 and $1.90 year-to-date per share in 2015 and $0.75 per share in second quarter 2014 and $1.50 year-to-date per share in 2014)				(84,207)		$ (84,207)
Purchase of treasury shares					(124,981)
Balance, end of period, shares at Jun. 30, 2015	44,192,526					68,555,000
Balance, end of period at Jun. 30, 2015	$ 685	2,084,636	(14,819)	8,267,038	(2,610,878)	$ 7,726,662
Balance, beginning of period, shares at Mar. 31, 2015	44,410,420
Issued during the period, shares	59,606
Treasury shares acquired, shares	(277,500)
Balance, beginning of period at Mar. 31, 2015	$ 685	2,073,977	52,969	8,099,936	(2,560,937)
Share-based compensation plans		10,659
Net increase (decrease) during the period			(67,788)			(67,788)
Net income (loss) attributable to Everest Re Group				209,057		209,057
Dividends declared ($0.95 per share in second quarter2015 and $1.90 year-to-date per share in 2015 and $0.75 per share in second quarter 2014 and $1.50 year-to-date per share in 2014)				(41,955)		$ (41,955)
Purchase of treasury shares					(49,941)
Balance, end of period, shares at Jun. 30, 2015	44,192,526					68,555,000
Balance, end of period at Jun. 30, 2015	$ 685	$ 2,084,636	$ (14,819)	$ 8,267,038	$ (2,610,878)	$ 7,726,662