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INVESTMENTS | 12 Months Ended
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Dec. 31, 2020
INVESTMENTS |
INVESTMENTS | 13.INVESTMENTS ​ AllDale III ​ As discussed in Note 12 – Variable Interest Entities, we account for our ownership interest in the income or loss of AllDale III as an equity method investment. We record equity income or loss based on AllDale III's distribution structure. The changes in our equity method investment in AllDale III for each of the periods presented were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2020 |  | 2019 |  | 2018
​ | ​ | (in thousands)
Beginning balance | ​ | $ | 28,529 | ​ | $ | 28,974 | ​ | $ | 14,182
Contributions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,600
Equity method investment income | ​ | ​ | 907 | ​ | ​ | 2,203 | ​ | ​ | 547
Distributions received | ​ | ​ | (1,895) | ​ | ​ | (2,648) | ​ | ​ | (1,355)
Other | ​ | ​ | (273) | ​ | ​ | — | ​ | ​ | —
Ending balance | ​ | $ | 27,268 | ​ | $ | 28,529 | ​ | $ | 28,974
​ As discussed in Note 4 – Long-Lived Asset Impairments, there was uncertainty related to energy demand in the First Quarter as a result of weak electricity demand and an oversupply and lack of storage for oil and natural gas, both due in part to the COVID-19 pandemic and other market and production factors, which could have impacted our investment in AllDale III. As a result, as part of our First Quarter impairment assessment, we compared the fair value of our investment to its carrying value and concluded that the fair value exceeded the carrying value and no impairment in our investment was necessary. In our subsequent impairment assessments, amid a modest recovery in commodity futures prices and increased clarity into production levels by operators during the year, we again compared the fair value of our investment to its carrying value and concluded no impairment was necessary. To calculate the fair value of the investment we used an income approach utilizing a discounted cash flow model based on our estimate of both production, prices and expenses from information available to us. Key assumptions used in our valuation are not observable in active markets; therefore, the fair value measurements represent Level 3 fair value measurements. The cash flow estimates used in our assessments, by their very nature, are dependent on conditions that could materially change in future periods based on new information. If in future periods changes to these estimates were to materially reduce our expected cash flows, an impairment of our investment could be necessary. ​ Kodiak ​ On July 19, 2017, Alliance Minerals purchased $100 million of Series A-1 Preferred Interests from Kodiak, a privately-held company providing large-scale, high-utilization gas compression assets to customers operating primarily in the Permian Basin. This structured investment provided us with a quarterly cash or payment-in-kind return. On February 8, 2019, Kodiak redeemed our preferred interest for $135.0 million in cash resulting in an $11.5 million gain due to an early redemption premium. The gain is included in the Equity securities income line item. We no longer hold any ownership interests in Kodiak. Prior to the redemption, we accounted for our ownership interests in Kodiak as equity securities without readily determinable fair values. ​ See Note 2 – Summary of Significant Accounting Policies for more information on our accounting policy for investments.

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