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Debt And Liquidity (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total	$ 1,420,131	$ 1,812,823
Less: Short-term Debt	(131)	(141)
Long-term debt	$ 1,420,000	$ 1,812,682
Effective interest rate, revolving credit facility	4.50%	5.30%	6.02%
Other Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 615	$ 705
Secured Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	500,000	0
Unamortized Financing Costs member
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(24,192)	(31,632)
2018 Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 943,708	$ 1,843,750

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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