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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES - Narrative (Details) $ in Thousands | Dec. 31, 2018 USD ($) | Jan. 01, 2018 USD ($)
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Discounted cash flow | Fair Value, Inputs, Level 3 | Annualized EBITDA and probability of achievement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liability for contingent consideration | $ 4,319 |
Discount rate | 0.073 |
ASI |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liability for contingent consideration |  | $ 4,600
ASI | Other Current and Long-term Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liability for contingent consideration | $ 4,300 |

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