EMPLOYEE BENEFIT PLAN - Unrealized gains, net related to the SERP assets (Details 1) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Non-qualified Supplemental Retirement Plan ("SERP")
Defined Benefit Plan Disclosure [Line Items]
Unrealized gains, net	$ 861	$ 428	$ 1,246	$ 1,981

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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