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DISCONTINUED OPERATIONS (Details) - Pipeline Inspection Group - USD ($)
$ in Millions
1 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Proceeds from divestiture of business $ 13.3  
Notes Receivable    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Principal amount of note received from buyer $ 1.5  
Stated interest rate on note   5.00%