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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Assets $ 22,967 $ 45,613
Cash and cash equivalents    
Assets:    
Money market funds 20,540 42,470
Other long-term assets    
Assets:    
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan 2,427 2,342
Interest rate swaps   801
Accrued and other long term liabilities    
Liabilities:    
Contingent consideration   4,472
Other long-term liabilities    
Liabilities:    
Interest rate swap 563  
Level 1    
Assets:    
Assets 22,967 44,812
Level 1 | Cash and cash equivalents    
Assets:    
Money market funds 20,540 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 2,427 2,342
Level 2    
Assets:    
Assets   801
Level 2 | Other long-term assets    
Assets:    
Interest rate swaps   801
Level 2 | Other long-term liabilities    
Liabilities:    
Interest rate swap $ 563  
Level 3 | Accrued and other long term liabilities    
Liabilities:    
Contingent consideration   $ 4,472