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OTHER ITEMS AND CHARGES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unusual or Infrequent Items, or Both [Abstract]        
Expense from acquisition activities $ 2,687   $ 1,872 $ 176
Contract settlement charges     2,100  
Development project charge   $ 0 $ 311 $ 0