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OTHER ITEMS AND CHARGES OTHER ITEMS AND CHARGES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unusual or Infrequent Items, or Both [Abstract]      
Contract settlement charge $ 2,100 $ 0 $ 0
Write-off deferral costs 1,872    
Expense from acquisition activities and other items   176  
Development project charge 311 0 0
Environmental remediation charge $ 0 $ 0 $ 900