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PROPERTY AND EQUIPMENT. (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Property, Plant and Equipment, Gross |  | $ 673,003 |  | $ 658,356
Accumulated Depreciation |  | (190,346) |  | (150,004)
Property, Plant and Equipment, Net | $ 442,810 | 482,657 | [1] | 508,352
Facilities And Plant Equipment [Member] |  |  |  |
Property, Plant and Equipment, Gross |  | 621,909 |  | 601,156
Land [Member] |  |  |  |
Property, Plant and Equipment, Gross |  | 8,970 |  | 8,970
Other Equipment, Vehicles and Furniture [Member] |  |  |  |
Property, Plant and Equipment, Gross |  | 11,812 |  | 10,189
Construction in Progress [Member] |  |  |  |
Property, Plant and Equipment, Gross |  | $ 30,312 |  | $ 38,041
[1] | Amounts derived from the audited consolidated financial statements for the year ended December 31, 2018.

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