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Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]      
Trade $ 87,048 $ 79,286  
Other 8,939 8,773  
Unbilled Receivables 21,187 20,911  
Total Receivables 117,174 108,970  
Less Allowance for Credit Losses 3,215 1,339 $ 1,407
Receivables, net of allowance for credit losses $ 113,959 $ 107,631