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Commitments And Contingencies (Narrative) (Details) - Equity Index Put Option [Member] - Standard & Poor's 500 [Member]	3 Months Ended
	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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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