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Select Balance Sheet Information - Schedule of Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Trade $ 112,060 $ 87,048    
Other 6,982 8,939    
Unbilled Receivables 18,331 21,187    
Total Receivables 137,373 117,174    
Less Allowance for Credit Losses 2,983 3,215 $ 1,681 $ 1,339
Receivables, net of allowance for credit losses $ 134,390 $ 113,959