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FAIR VALUE - Contingent Consideration Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 31, 2019 | May 31, 2019
--- | --- | --- | --- | ---
Level 3 |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent consideration obligation | $ 31,140 | $ 5,930 |  |
Fusion Acquisition | Level 3 |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent consideration obligation | 26,910 | 0 |  |
Noble Acquisition |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent consideration obligation | 4,200 |  | $ 2,900 |
Noble Acquisition | Level 3 |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent consideration obligation | 4,230 | 2,930 |  |
Gateway Acquisition |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent consideration obligation |  |  |  | $ 3,000
Gateway Acquisition | Level 3 |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent consideration obligation | $ 0 | $ 3,000 |  |

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