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, 2019
Dec. 31, 2018
Receivables [Abstract]    
Trade Accounts Receivable $ 131,990 $ 150,764
Unbilled Recoverable Costs and Accrued Profits 19,567 33,030
Total Receivables, Gross 151,557 183,794
Less Allowance for Doubtful Accounts (3,559) (1,486)
Accounts Receivable $ 147,998 $ 182,308