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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
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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 |  |

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