Reinsurance (Affiliated Quota Share Reinsurance Agreements For All New And Renewal Business For The Indicated Coverage Period) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Coverage Period 01/01/2010-12/31/2010 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re
Percent Ceded	44.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	$ 150,000
Aggregate Limit	$ 325,000
Coverage Period 01/01/2011-12/31/2011 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re
Percent Ceded	50.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	$ 150,000
Aggregate Limit	$ 300,000
Coverage Period 01/01/2012-12/31/2014 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re
Percent Ceded	50.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	$ 100,000
Aggregate Limit	$ 200,000
Coverage Period 01/01/2015-12/31/2016 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re
Percent Ceded	50.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	$ 162,500
Aggregate Limit	$ 325,000
Coverage Period 01/01/2017-12/31/2017 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re
Percent Ceded	60.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	$ 219,000
Aggregate Limit	$ 438,000
Coverage Period 01/01/2010-12/31/2010 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	60.00%
Assuming Company	Bermuda Re
Type of Business	property business
Single Occurrence Limit	$ 350,000
Aggregate Limit
Coverage Period 01/01/2011-12/31/2011 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	60.00%
Assuming Company	Bermuda Re
Type of Business	property business
Single Occurrence Limit	$ 350,000
Aggregate Limit
Coverage Period 01/01/2012-12/31/2012 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	75.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	$ 206,250
Aggregate Limit	$ 412,500
Coverage Period 01/01/2013-12/31/2013 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	75.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	$ 150,000
Aggregate Limit	$ 412,500
Coverage Period 01/01/2014-12/31/2017 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	75.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	$ 262,500
Aggregate Limit	$ 412,500
Coverage Period 01/01/2012-12/31/2017 [Member]
Reinsurance [Line Items]
Ceding Company	Everest Canada
Percent Ceded	80.00%
Assuming Company	Everest Re-   Canadian Branch
Type of Business	property business
Single Occurrence Limit
Aggregate Limit
Coverage Period 01/01/2020-01/01/2021 [Member]
Reinsurance [Line Items]
Ceding Company	Everest International Assurance
Percent Ceded	100.00%
Assuming Company	Bermuda Re
Type of Business	life business
Single Occurrence Limit
Aggregate Limit