FAIR VALUE MEASUREMENT (Details) $ in Thousands	Dec. 31, 2018 USD ($) insurance_policy	Dec. 31, 2017 USD ($)
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	$ 18,300
Deferred compensation assets	18,400	18,400
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	148	95
Total fair value	148	95
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	148	95
Total fair value	$ 148	$ 95