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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2020

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Summary of intangible assets

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December 31, 2020

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December 31, 2019

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Accumulated

Intangibles,

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Accumulated

Intangibles,

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Original Cost

Amortization

Net

Original Cost

Amortization

Net

​

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(in thousands)

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Non-compete agreements

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$

—

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$

—

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$

—

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$

9,803

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$

(9,440)

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$

363

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Customer contracts and other

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10,623

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(5,744)

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4,879

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32,371

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(24,258)

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8,113

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Mining permits

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1,500

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(373)

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1,127

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1,500

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(307)

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1,193

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Total

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$

12,123

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$

(6,117)

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$

6,006

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$

43,674

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$

(34,005)

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$

9,669

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Schedule of estimated amortization expense attributable to intangible assets

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​	​	​	​	​
Year Ended December 31,	​	​	(in thousands)
2021	​	$	2,831	​
2022	​		1,600	​
2023	​		647	​
2024	​		66	​
2025	​		66	​
Thereafter	​		795	​

Summary of advance royalties

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​	​	​	​	​	​	​	​
​		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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- Definition

Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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