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Commitments And Contingencies (Narrative) (Details) - Equity Index Put Option [Member] - Standard & Poor's 500 [Member] | 3 Months Ended
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Mar. 31, 2021 USD ($) Item $ / Item
Derivative [Line Items] |
Number of equity index put option contracts | Item | 1
Probability of falling below strike price, percentage | 0.20%
Index | $ / Item | 3,972.89
Theoretical [Member] |
Derivative [Line Items] |
Maximum discount factor | 3.00%
Maximum payout occurs based on index value | $ 148,976,000
If Contracts Expire [Member] |
Derivative [Line Items] |
Settlement amount | $ 0

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