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Commitments And Contingencies (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Item $ / Item | Dec. 31, 2005 Item
Derivative [Line Items] |  |
Number of equity index put option contracts | Item |  | 7
Equity Index Put Option [Member] | Standard & Poor's 500 [Member] |  |
Derivative [Line Items] |  |
Number of equity index put option contracts | Item | 1 |
Probability of falling below strike price, percentage | 0.20% |
Index | $ / Item | 3,756.07 |
Equity Index Put Option [Member] | Standard & Poor's 500 [Member] | Theoretical [Member] |  |
Derivative [Line Items] |  |
Maximum discount factor | 3.00% |
Maximum payout occurs based on index value | $ | $ 147,894,000 |
Equity Index Put Option [Member] | Standard & Poor's 500 [Member] | If Contracts Expire [Member] |  |
Derivative [Line Items] |  |
Settlement amount | $ | $ 0 |

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