Inventories (Schedule Of Inventory Costs) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Inventories [Abstract]
Raw materials	$ 349,069	$ 304,069
Work in process	9,929	8,282
Finished goods	4,667	2,605
Inventories	$ 363,665	$ 314,956

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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