Annual report pursuant to Section 13 and 15(d)

Accounts Receivable - Summary of Accounts Receivable (Details)

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Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade Accounts Receivable $ 78,577 $ 131,990
Unbilled Recoverable Costs and Accrued Profits 17,697 19,567
Total Receivables, Gross 96,274 151,557
Less Allowance for Estimated Credit Losses (3,218) (3,559)
Total Receivables, Net $ 93,056 $ 147,998