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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 23, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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 of investments		$ 322,460		$ 322,460
Investments fair value, amount less than amortized cost		140		140		$ 117
Fair value of investments in rabbi trust		18,418		18,418		$ 15,296
Asset impairments		$ 519	$ 2,380	$ 3,228	$ 10,029
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		$ 9,109		$ 9,109
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				19 months

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