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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
item
Level 3 | Discount Rate    
Liabilities:    
Measurement input | item   0.125
Recurring basis    
Assets:    
Assets $ 45,613 $ 17,358
Recurring basis | Cash and cash equivalents    
Assets:    
Money market funds 42,470 14,518
Recurring basis | Other long-term assets    
Assets:    
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan 2,342 2,359
Interest rate swaps 801 481
Recurring basis | Accrued and other long term liabilities    
Liabilities:    
Contingent consideration 4,472 6,970
Recurring basis | Level 1    
Assets:    
Assets 44,812 16,877
Recurring basis | Level 1 | Cash and cash equivalents    
Assets:    
Money market funds 42,470 14,518
Recurring basis | Level 1 | Other long-term assets    
Assets:    
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan 2,342 2,359
Recurring basis | Level 2    
Assets:    
Assets 801 481
Recurring basis | Level 2 | Other long-term assets    
Assets:    
Interest rate swaps 801 481
Recurring basis | Level 3 | Accrued and other long term liabilities    
Liabilities:    
Contingent consideration $ 4,472 $ 6,970