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EQUITY INVESMENTS (Investments Accounted for by the Equity Method) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | May 01, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity investments and investments in subsidiaries | $ 244,119 |  | $ 236,121 |
Income from equity method investments, net | $ (4,273) | $ (13,536) |  |
Investment in Tatex Thailand II, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate ownership % | 23.50% |  |  |
Equity investments and investments in subsidiaries | $ 0 |  | 0 |
Income from equity method investments, net | $ (140) | (41) |  |
Investment in Grizzly Oil Sands ULC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate ownership % | 24.9999% |  |  |
Equity investments and investments in subsidiaries | $ 48,004 |  | 44,259 |
Income from equity method investments, net | $ 393 | 330 |  |
Investment in Timber Wolf Terminals LLC(1) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate ownership % | 0.00% |  |  |
Equity investments and investments in subsidiaries | $ 0 |  | 0 |
Income from equity method investments, net | $ 0 | 2 |  |
Investment in Windsor Midstream LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate ownership % | 22.50% |  |  |
Equity investments and investments in subsidiaries | $ 39 |  | 39 |
Income from equity method investments, net | 0 | 0 |  |
Investment in Mammoth Energy Services, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity investments and investments in subsidiaries | 196,076 |  | 191,823 |
Income from equity method investments, net | $ (4,526) | (13,470) |  |
Investment in Strike Force Midstream LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate ownership % | 0.00% |  |  | 25.00%
Equity investments and investments in subsidiaries | $ 0 |  | $ 0 |
Income from equity method investments, net | $ 0 | $ (357) |  |

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