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Receivables (Net Components Of Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Customers, trade $ 1,538,348 $ 1,386,306
Income tax receivable 9,835 8,616
Other 96,079 59,564
Receivables, gross 1,644,262 1,454,486
Less allowance for discounts, returns, claims and doubtful accounts 86,103 78,335
Receivables, net $ 1,558,159 $ 1,376,151