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Accounts Receivable
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Accounts Receivable ACCOUNTS RECEIVABLE
Accounts receivable at December 31 consists of:
(In thousands)20202019
Trade Accounts Receivable$78,577 $131,990 
Unbilled Recoverable Costs and Accrued Profits17,697 19,567 
Total Receivables, Gross96,274 151,557 
Less Allowance for Estimated Credit Losses(3,218)(3,559)
Total Receivables, Net$93,056 $147,998 
The following table provides a roll-forward of the allowance for estimated credit losses that is deducted from accounts receivable to present the net amount expected to be collected at December 31:
(In thousands)
Balance at December 31, 2018
$1,486 
Bad Debt Expense, Net of Recoveries2,144 
Write-off Charges Against the Allowance and Other Adjustments(71)
Balance at December 31, 2019
$3,559 
Bad Debt Expense, Net of Recoveries1,913 
Write-off Charges Against the Allowance and Other Adjustments(2,254)
Balance at December 31, 2020
$3,218