PROPERTY AND EQUIPMENT. (Details) - USD ($) $ in Thousands |
Sep. 30, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| 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 | ||||
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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