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COMMITMENTS AND CONTINGENCIES - General Litigation (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 09, 2018 | Dec. 31, 2018
Loss Contingency, Information about Litigation Matters [Abstract] |  |
Settlement per agreement | $ 93,000 |
Purchase of coal reserves, agreed amount | 2,000 |
Legal and other costs of settlement | 13,000 |
Net gain from settlement | $ 80,000 | $ 80,000

X
- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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X
- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
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X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- References No definition available. + Details
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X
- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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