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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Summary of intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019 |
​ | ​ | ​ | ​ |  | Accumulated |  | Intangibles, |  | ​ | ​ |  | Accumulated |  | Intangibles, |
​ |  | Original Cost |  | Amortization |  | Net |  | Original Cost |  | Amortization |  | Net |
​ | ​ | (in thousands) | ​
Non-compete agreements | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 9,803 | ​ | $ | (9,440) | ​ | $ | 363 | ​
Customer contracts and other | ​ |  | 10,623 | ​ |  | (5,744) | ​ |  | 4,879 | ​ |  | 32,371 | ​ |  | (24,258) | ​ |  | 8,113 | ​
Mining permits | ​ |  | 1,500 | ​ |  | (373) | ​ |  | 1,127 | ​ |  | 1,500 | ​ |  | (307) | ​ |  | 1,193 | ​
Total | ​ | $ | 12,123 | ​ | $ | (6,117) | ​ | $ | 6,006 | ​ | $ | 43,674 | ​ | $ | (34,005) | ​ | $ | 9,669 | ​
Schedule of estimated amortization expense attributable to intangible assets | ​
​ | ​ | ​ | ​ | ​
Year Ended December 31, | ​ | ​ | (in thousands) |
2021 | ​ | $ | 2,831 | ​
2022 | ​ |  | 1,600 | ​
2023 | ​ |  | 647 | ​
2024 | ​ |  | 66 | ​
2025 | ​ |  | 66 | ​
Thereafter | ​ |  | 795 | ​
Summary of advance royalties | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |
​ | ​ | 2020 |  | 2019 | ​
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Advance royalties, affiliates (see Note 21 – Related-Party Transactions) | ​ | $ | 48,389 | ​ | $ | 41,216 | ​
Advance royalties, third-parties | ​ |  | 12,570 | ​ |  | 12,685 | ​
Total advance royalties | ​ | $ | 60,959 | ​ | $ | 53,901 | ​

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