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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 23, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Aug. 06, 2020	Apr. 16, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment maturity term				1 year
Fair value held-to-maturity investments, curent		$ 301,534		$ 301,534
Unrealized holding loss		92		92		$ 117
Reserve for expected credit losses		423		423
Fair value of investments in rabbi trust		18,669		18,669		$ 15,296
Asset impairments		240	$ 2,935	3,468	$ 12,965
US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value held-to-maturity investments		461,876		461,876
Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value held-to-maturity investments		$ 18,000		$ 18,000
Supplier [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Ownership percentage		12.70%		12.70%			3.20%	10.00%
Cash consideration		$ 10,000		$ 10,000			$ 2,500	$ 7,500
Carrying value		$ 9,120		$ 9,120
Nuro [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Shares acquired	766
Cash consideration	$ 10,000
Maximum [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment maturity term				20 months

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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