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Basis Of Presentation Accounts Receivables Table (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts and other receivables, net of allowance for doubtful accounts and sales returns of $3,194 in 2019 and $2,937 in 2018 $ 122,947 $ 124,727