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NEW ACCOUNTING PRONOUNCEMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impairment of goodwill | $ 4,900 | $ 4,944 | $ 0 |
Minimum | Scenario, Forecast | Accounting Standards Update 2016-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease, right-of-use asset |  |  |  | $ 9,200
Operating lease, liability |  |  |  | 9,200
Maximum | Scenario, Forecast | Accounting Standards Update 2016-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease, right-of-use asset |  |  |  | 10,200
Operating lease, liability |  |  |  | $ 10,100

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