Receivables (Summary Of Net Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Accounts Receivable, Gross, Current	$ 1,389,724	$ 1,322,278
Less: Allowance for doubtful accounts	152,494	153,566
Total receivables, net	$ 1,237,230	$ 1,168,712

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant