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OTHER ITEMS AND CHARGES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unusual or Infrequent Items, or Both [Abstract]      
Expense from acquisition activities $ 1,862 $ 2,687 $ 1,872
Contract settlement charges     2,100
Development project charge $ 0 $ 0 $ 311