FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($) financial_instrument	Dec. 31, 2018 USD ($)
Fair value of financial instruments [Abstract]
Number of financial instruments held for trading purposes \| financial_instrument	0
Level 1
Fair value of financial instruments [Abstract]
Related rabbi trust assets	$ 1,642	$ 265
Money Market Funds \| Level 1
Fair value of financial instruments [Abstract]
Cash and cash equivalents	$ 800	$ 793

The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_AssetsHeldInTrustNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant