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DISCONTINUED OPERATIONS - Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash provided by discontinued operating activities $ 40,321 $ 9,365 $ 111,315
Cash used in discontinued investing activities (44) (80) (77)
Cash used in discontinued financing activities (574) (3,000) (3,000)
Sale | MSLO      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash provided by discontinued operating activities 40,321 9,365 111,315
Cash used in discontinued investing activities (44) (80) (77)
Cash used in discontinued financing activities $ (574) $ (3,000) $ (3,000)