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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Level 3    
Liabilities:    
Discount rate (as a percent) 12.50% 12.30%
Recurring basis    
Assets:    
Assets $ 17,358 $ 7,923
Liabilities:    
Liabilities   7,317
Recurring basis | Cash and cash equivalents    
Assets:    
Money market funds 14,518 5,703
Recurring basis | Other long-term assets    
Assets:    
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan 2,359 2,220
Recurring basis | Accrued and other long term liabilities    
Assets:    
Interest rate swap 481  
Liabilities:    
Interest rate swap   542
Recurring basis | Other long-term liabilities    
Liabilities:    
Contingent consideration 6,970 6,775
Recurring basis | Level 1    
Assets:    
Assets 16,877 7,923
Recurring basis | Level 1 | Cash and cash equivalents    
Assets:    
Money market funds 14,518 5,703
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 2,359 2,220
Recurring basis | Level 2    
Assets:    
Assets 481  
Liabilities:    
Liabilities   542
Recurring basis | Level 2 | Accrued and other long term liabilities    
Assets:    
Interest rate swap 481  
Liabilities:    
Interest rate swap   542
Recurring basis | Level 3    
Liabilities:    
Liabilities   6,775
Recurring basis | Level 3 | Other long-term liabilities    
Liabilities:    
Contingent consideration $ 6,970 $ 6,775