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FAIR VALUE - Contingent Consideration Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Apr. 01, 2020
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Level 3 |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair value of contingent consideration arrangement | $ 34,250 | $ 31,140 |
Fusion Packaging |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair value of contingent consideration arrangement | 28,300 |  | $ 19,100
Fusion Packaging | Level 3 |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair value of contingent consideration arrangement | 28,340 | 26,910 |
Noble | Level 3 |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair value of contingent consideration arrangement | $ 5,910 | $ 4,230 |

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