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Trade and Other Receivables, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross $ 38,876 $ 30,689  
Unbilled Receivables, Current 3,924 2,555  
Accounts Receivable, Net, Current 42,800 33,244  
Allowance for Doubtful Accounts Receivable (978) (760)  
Account and Unbilled Receivables, Net 41,822 32,484  
Bad debt expense $ 223 $ 0 $ 223