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FAIR VALUE MEASUREMENT (Details) $ in Thousands | Dec. 31, 2017 USD ($) insurance_policy | Dec. 31, 2016 USD ($)
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Number of life insurance policies | insurance_policy | 70 |
Life insurance policies, net face value | $ 43,400 |
Cash surrender value of life insurance policies | 18,300 | $ 15,700
Deferred compensation assets | 18,400 | 15,900
Deferred compensation plan | Estimate of Fair Value, Fair Value Disclosure |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 95 | 188
Total fair value | 95 | 188
Deferred compensation plan | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 95 | 188
Total fair value | $ 95 | $ 188

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