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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 06, 2020	Apr. 16, 2020
Schedule of Equity Method Investments [Line Items]
Investments fair value, amount less than amortized cost	$ 117,000
Investments, impairment charge	0	$ 0
Asset impairments	$ 16,683,000	$ 2,897,000	$ 56,093,000
US Treasury Securities [Member]
Schedule of Equity Method Investments [Line Items]
Investment maturity term	16 months
Investments maturing within one year	$ 343,616,000
Supplier [Member]
Schedule of Equity Method Investments [Line Items]
Additional investment acquired, percentage				3.20%
Ownership percentage	12.90%				10.00%
Cash consideration	$ 10,000,000			$ 2,500,000	$ 7,500,000
Carrying value	$ 9,529,000

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