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EQUITY INVESTMENTS (Investments Accounted for by the Equity Method) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity investments and investments in subsidiaries | $ 16,560,000 |  | $ 16,560,000 |  |  | $ 32,044,000
Loss from equity method investments, net | $ (153,000) | $ (43,082,000) | $ (10,987,000) | $ (164,391,000) |  |
Investment in Grizzly Oil Sands ULC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Approximate ownership % | 24.60% |  | 24.60% |  |  |
Equity investments and investments in subsidiaries | $ 16,521,000 |  | $ 16,521,000 |  |  | 21,000,000
Loss from equity method investments, net | $ (153,000) | (41,000) | $ (341,000) | (380,000) |  |
Investment in Mammoth Energy Services, Inc. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Approximate ownership % | 21.50% |  | 21.50% |  |  |
Equity investments and investments in subsidiaries | $ 0 |  | $ 0 |  | $ 0 | 11,005,000
Loss from equity method investments, net | $ 0 | (43,041,000) | $ (10,646,000) | (166,096,000) |  |
Investment in Windsor Midstream LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Approximate ownership % | 22.50% |  | 22.50% |  |  |
Equity investments and investments in subsidiaries | $ 39,000 |  | $ 39,000 |  |  | 39,000
Loss from equity method investments, net | $ 0 | 0 |  | 0 |  |
Investment in Tatex Thailand II, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Approximate ownership % | 23.50% |  | 23.50% |  |  |
Equity investments and investments in subsidiaries | $ 0 |  | $ 0 |  |  | $ 0
Loss from equity method investments, net | $ 0 | $ 0 | $ 0 | $ 2,085,000 |  |

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