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Equity Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of investments accounted for by the equity method | Investments accounted for by the equity method consist of the following as of December 31, 2020 and 2019:
|  |  | Carrying Value |  | Loss (income) from equity method investments
| Approximate Ownership % |  | December 31, |  | For the Year Ended December 31,
|  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2018
|  |  | (In thousands)
Investment in Grizzly Oil Sands ULC | 24.5 | % |  | $ | 24,816 |  |  | $ | 21,000 |  |  | $ | 377 |  |  | $ | 32,710 |  |  | $ | 510 |
Investment in Mammoth Energy Services, Inc. | 21.5 | % |  | — |  |  | 11,005 |  |  | 10,646 |  |  | 179,524 |  |  | (49,969) |
Investment in Tatex Thailand II, LLC | 23.5 | % |  | — |  |  | — |  |  | — |  |  | (2,086) |  |  | (241) |
Other equity investments(1) | — | % |  | — |  |  | 39 |  |  | 32 |  |  | — |  |  | (204) |
|  |  | $ | 24,816 |  |  | $ | 32,044 |  |  | $ | 11,055 |  |  | $ | 210,148 |  |  | $ | (49,904) |
_____________________ (1) Consists of sold/dissolved investments, including Windsor Midstream, LLC, which was dissolved as of December 31, 2020. Additionally, this includes the Company's investment in Strike Force that was sold in 2018, from which the Company recognized a gain of $96.4 million net of transaction fees, which is included in gain on sale of equity method investments in the accompanying consolidated statement of operations for the year ended December 31, 2018.
Schedule of Equity Investments - Balance Sheet | Summarized balance sheet information:
| December 31,
| 2020 |  | 2019
| (In thousands)
Current assets | $ | 483,303 |  |  | $ | 421,326 |
Noncurrent assets | $ | 1,092,495 |  |  | $ | 1,260,075 |
Current liabilities | $ | 132,978 |  |  | $ | 132,569 |
Noncurrent liabilities | $ | 148,240 |  |  | $ | 163,241 |
Schedule of Equity Investments - Income Statement | Summarized results of operations:
| December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands)
Gross revenue | $ | 313,076 |  |  | $ | 625,012 |  |  | $ | 1,729,778 |
Net (loss) income | $ | (106,072) |  |  | $ | (76,523) |  |  | $ | 253,451 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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