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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details) - Recurring basis - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Assets	$ 21,745	$ 45,613
Cash and cash equivalents
Assets:
Money market funds	18,530	42,470
Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	2,864	2,342
Interest rate swaps	351	801
Accrued and other long term liabilities
Liabilities:
Contingent consideration		4,472
Level 1
Assets:
Assets	21,394	44,812
Level 1 | Cash and cash equivalents
Assets:
Money market funds	18,530	42,470
Level 1 | Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	2,864	2,342
Level 2
Assets:
Assets	351	801
Level 2 | Other long-term assets
Assets:
Interest rate swaps	$ 351	801
Level 3 | Accrued and other long term liabilities
Liabilities:
Contingent consideration		$ 4,472

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