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Accounts Receivable (Accounts Receivable) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade receivables $ 371,848 $ 334,059
Allowance for doubtful accounts (7,155) (5,674)
Other allowances (2,740) (2,644)
Accounts receivable, net $ 361,953 $ 325,741