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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%

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