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Basis Of Presentation - Accounts and Other Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, before Allowance for Credit Loss, Current   $ 82,369 $ 89,747
Other Receivables   2,466 2,199
Allowance for Doubtful Accounts, Premiums and Other Receivables   2,746 2,829
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) $ 200    
Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, after Allowance for Credit Loss   82,089 89,117
Receivables, Net, Current   $ 84,835 $ 91,946