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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total provisions for allowance for credit losses on receivables | $ 3,264 |
Deferred compensation, mutual funds held by the trust | 6,104 | $ 4,461
Deferred compensation obligations | 6,110 | 6,143
Fair Value, Inputs, Level 2 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Deferred compensation, mutual funds held by the trust | $ 4,097 | $ 2,420
Minimum |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Payment terms, period | 30 days |
Maximum |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Payment terms, period | 60 days |

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