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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
	Mar. 23, 2021	Mar. 31, 2021	Mar. 31, 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 of investments		$ 363,585
Investments fair value, amount less than amortized cost		94		$ 117
Fair value of investments in rabbi trust		17,505		$ 15,296
Asset impairments		$ 2,709	$ 7,650
Supplier [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Ownership percentage		12.70%			3.20%	10.00%
Cash consideration		$ 10,000			$ 2,500	$ 7,500
Carrying value		$ 9,202
Nuro [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Shares acquired	766
Cash consideration	$ 10,000
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment maturity term		17 months

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