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Supplemental Cash Flow Information (Schedule Of Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash paid during the year for
Interest and financing expenses (net of capitalization)	$ 26,148	$ 28,523	$ 28,915
Income taxes	62,238	64,899	76,859
Supplemental disclosure of non-cash transactions
Non-cash additions to property, plant, and equipment	$ 5,106	$ 6,025	$ 3,076

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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