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FAIR VALUE (Details) - Recurring basis - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Level 1    
Assets (liabilities)    
Pension plan assets $ 6,948 $ 6,347
Deferred compensation plan assets 4,563 5,386
Level 2    
Assets (liabilities)    
Interest rate swaps (886) $ (1,889)
Foreign currency hedge contracts $ (51)