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Basis Of Presentation - Accounts and Other Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, before Allowance for Credit Loss, Current $ 104,604 $ 106,153
Other Receivables 4,772 4,441
Allowance for Doubtful Accounts, Premiums and Other Receivables 3,165 3,036
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) 200  
Accounts and other receivables, net of allowance for doubtful accounts and sales returns of $3,165 in 2020 and $3,036 in 2019 106,211 107,558
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, after Allowance for Credit Loss 106,211 107,558
Accounts and other receivables, net of allowance for doubtful accounts and sales returns of $3,165 in 2020 and $3,036 in 2019 $ 109,376 $ 110,594