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Debt And Liquidity (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 1,564,578	$ 1,812,823
Less: Short-term debt	(147)	(141)
Long-term debt	1,564,431	1,812,682
Other debt
Debt Instrument [Line Items]
Total debt	675	619
2018 Credit Agreement
Debt Instrument [Line Items]
Total debt	$ 1,563,903	$ 1,812,204

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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