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Receivables (Schedule of Trade Accounts Receivables Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]        
Accounts receivable - trade $ 405,159 $ 398,723    
Allowance for credit losses (4,825) (6,258) $ (1,062) $ (7,393)
Accounts receivable - trade, net $ 400,334 $ 392,465