Inventories (Schedule Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Inventories [Abstract]
Raw materials	$ 83,199	$ 78,434	$ 73,023
Work in process	2,254	2,074	4,239
Finished goods	14,324	16,859	14,151
Inventories	$ 99,777	$ 97,367	$ 91,413

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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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