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FAIR VALUE (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Assets (liabilities)    
Other long-term assets $ 4,026 $ 4,835
Recurring basis | Level 1    
Assets (liabilities)    
Pension plan assets 5,002 6,099
Other long-term assets 3,884 4,690
Recurring basis | Level 2    
Assets (liabilities)    
Interest rate swaps $ (1,795) $ (363)