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Basis Of Presentation Accounts Receivables Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts and other receivables, net of allowance for doubtful accounts and sales returns of $5,764 in 2018 and $3,304 in 2017 $ 125,368 $ 120,135