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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Assets and Liabilities of TMS (Details) - TMS
$ in Thousands
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]  
Cash $ 694
Trade accounts receivable 7
Due from affiliates 456
Other current assets 456
Property, plant and equipment 991
Other assets, net 484
Trade accounts payable (1,205)
Accrued and other liabilities (3,025)
Equity $ (1,142)