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Summary Of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) Item shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2005 Item | Dec. 31, 2001 Item | Jan. 01, 2019 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Minimum percent of prepaid reinsurance premiums for any foreign reinsurers that were collateralized | 10.00% |  |  |  |  |  |  |
Number of operating segments | Item | 4 |  |  |  |  |  |  |
Equity index put option contracts sold | Item |  |  |  | 7 | 7 |  |  |
Derivatives, number of indices | Item |  |  |  | 2 | 2 |  |  |
Derivative liability | $ 5,584,000 | $ 11,958,000 |  |  |  |  |  |
Anti-dilutive options | shares | 0 | 0 | 0 |  |  |  |  |
U.S. tax rate | 21.00% | 21.00% | 35.00% |  |  |  |  |
Operating lease right of use assets | $ 161,435,000 |  |  |  |  | $ 69,869,000 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  |  |  |  |  | Other assets |  |
Operating lease liabilities | $ 169,909,000 |  |  |  |  | $ 77,270,000 |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  |  |  |  |  | Other liabilities |  |
Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  |  | $ (1,201,000) |  |  |  | $ (1,250,000) | $ (1,250,000)
Retained Earnings [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  |  | $ 1,201,000 |  |  | $ 0 | $ 1,250,000 | $ 1,250,000
Minimum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Options expiration date | Feb. 24, 2020 |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Options expiration date | Sep. 19, 2022 |  |  |  |  |  |  |
Expired Derivative [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of derivatives | Item | 4 |  |  |  |  |  |  |
Derivative liability | $ 0 |  |  |  |  |  |  |

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