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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of inventories

Inventories consisted of the following as of December 31, 2023 and 2024 (in thousands):

​	​	​	​	​	​	​
​		December 31,			December 31,
​	​	2023		​	2024
Raw materials and spare parts	​	$	45,335	​	$	43,434
Total inventory	​	$	45,335	​	$	43,434

​

Schedule of finite-lived intangible assets

The Company’s intangible assets as of December 31, 2023 and 2024 were as follows (in thousands):

​	​	​	​	​	​	​
​		2023			2024
Customer relationships	​	$	5,376	​	$	5,376
Acquired contracts	​		10,749	​		10,749
Trademark and trade names	​		2,700	​		2,700
Non-compete agreements	​		860	​		860
Total intangible assets	​		19,685	​		19,685
Less accumulated amortization	​		(13,320)	​		(13,320)
Net intangible assets	​	$	6,365	​	$	6,365

Schedule of goodwill

The following table summarizes the activity related to the carrying amount of goodwill (in thousands):

​	​	​	​
Balance as of December 31, 2022	​	$	64,328
Balance as of December 31, 2023	​	$	64,328
Balance as of December 31, 2024	​	$	64,328

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