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Schedule II - Condensed Financial Information Of The Registrant (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 217,644	$ 104,398	$ 332,868	$ 354,551	$ (385,313)	$ 198,381	$ 60,787	$ 215,186	$ 687,419	$ 275,973	$ 474,354	$ 1,009,461	$ 89,041	$ 482,751
Change in other assets and liabilities, net												(54,176)	(322,107)	(66,998)
Amortization of bond premium (accrual of bond discount)												30,936	29,272	45,867
Realized capital losses (gains)	(75,443)	$ 12,943	$ (30,272)	(92,232)	172,815	$ (54,804)	$ (15,776)	24,901				(185,004)	127,136	(153,194)
Non-cash compensation expense												34,018	32,369	30,297
Net cash provided by (used in) operating activities												1,852,002	610,069	1,162,693
Proceeds from fixed maturities sold - available for sale, at market value												3,280,237	3,148,428	2,401,844
Distributions from other invested assets												284,558	3,102,018	5,579,043
Cost of fixed maturities acquired - available for sale, at market value												(6,613,917)	(5,909,504)	(5,131,098)
Cost of other invested assets acquired												(425,438)	(3,370,455)	(5,829,271)
Net change in short-term investments												(167,290)	455,350	(73,923)
Net cash provided by (used in) investing activities												(1,412,492)	(279,621)	(732,577)
Purchase of treasury shares												(24,604)	(75,304)	(50,000)
Dividends paid to shareholders												(234,322)	(216,221)	(207,242)
Net cash provided by (used in) financing activities												(275,687)	(316,594)	(275,458)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)												1,009,461	89,041	482,751
Equity in retained (earnings) deficit of subsidiaries												(1,026,233)	(112,859)	(509,279)
Change in other assets and liabilities, net												564	4,824	6,107
Increase (decrease) in due to/from affiliate												(2,209)	683	(6,470)
Amortization of bond premium (accrual of bond discount)												(9)	(577)	12
Realized capital losses (gains)												66	57	(80)
Non-cash compensation expense												2,796	2,740	3,448
Net cash provided by (used in) operating activities												584,436	933,909	401,489
Additional investment in subsidiaries												(478,125)	(542,965)	(109,815)
Proceeds from fixed maturities matured/called - available for sale, at market value												63	93	696
Proceeds from fixed maturities sold - available for sale, at market value												74,841	24,856	90,154
Distributions from other invested assets												(200,267)		(189,308)
Cost of fixed maturities acquired - available for sale, at market value												(686,528)	(923,828)	(503,937)
Cost of other invested assets acquired												644,918	1,026,297	546,414
Net change in short-term investments
Net cash provided by (used in) investing activities												(645,098)	(415,547)	(165,796)
Common shares issued during the period, net												22,861	20,086	22,790
Purchase of treasury shares												(24,604)	(75,304)	(50,000)
Dividends paid to shareholders												(234,322)	(216,221)	(207,242)
Net cash provided by (used in) financing activities												63,935	(521,439)	(234,452)
EFFECT OF EXCHANGE RATE CHANGES ON CASH
Net increase (decrease) in cash												3,273	(3,077)	1,241
Cash, beginning of period				$ 198				$ 3,275	$ 198	$ 3,275	$ 3,275	198	3,275	2,034
Cash, end of period	$ 3,471				$ 198							3,471	198	3,275
Parent Company [Member] | Everest International [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries													200,000
Parent Company [Member] | Mt. Logan Re [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries														25,000
Bermuda Re [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries												$ 600,000	$ 750,000	$ 400,000

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