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Supplemental Financial Information
 6 Months Ended
Jun. 30, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Supplemental Financial Information Supplemental Financial Information
Supplemental Balance Sheet Information
The following table summarizes the components of Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets:
As of
(in thousands)June 30,
2023		December 31,
2022
Other long-term assets, net:
Right of use assets, operating leases, net$11,292 $7,734 
Intangible assets, net8,222 847 
Spare parts, net7,647 6,789 
Upfront Customer Consideration6,221 6,475 
Mine development costs, net6,629 5,478 
Mine reclamation asset, net1,591 1,641 
Other 2,622 1,683 
Total other long-term assets, net$44,224 $30,647 
Mine development costs include acquisition costs, the cost of other development work and mitigation costs related to the Five Forks Mine and are depleted over the estimated life of the related mine reserves. The Company performs an evaluation of the recoverability of the carrying value of mine development costs to determine if facts and circumstances indicate that their carrying value may be impaired and if any adjustment is warranted. There were no indicators of impairment as of June 30, 2023.
Spare parts include critical spares required to support plant operations. Parts and supply costs are determined using the lower of cost or estimated replacement cost. Parts are recorded as maintenance expenses in the period in which they are consumed or are capitalized if applicable.
Mine reclamation asset, net represents an asset retirement obligation ("ARO") asset related to the Five Forks Mine and is depreciated over its estimated life.
As of June 30, 2023 and December 31, 2022, Other includes the Highview Investment in the amount of $0.6 million and $0.6 million, respectively, that is carried at cost, less impairment, plus or minus observable changes in price for identical or similar investments of the same issuer. Fair value measurements, if any, represent Level 2 measurements. The Highview Investment is evaluated for indicators of impairment such as an event or change in circumstances that may have a significant adverse effect on the fair value of the investment. There were no changes to the carrying value of the Highview Investment for the three and six months ended June 30, 2023 as there were no indicators of impairment or observable price changes for identical or similar investments.
The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Condensed Consolidated Balance Sheets:
 As of
(in thousands)June 30,
2023		December 31,
2022
Other current liabilities:
Current portion of operating lease obligations$2,375 $2,724 
Income and other taxes payable1,069 1,039 
Current portion of mine reclamation liability169 548 
Other(1)
2,762 2,334 
Total other current liabilities$6,375 $6,645 
Other long-term liabilities:
Operating lease obligations, long-term$9,006 $5,133 
Mine reclamation liabilities5,323 7,985 
Other806 733 
Total other long-term liabilities$15,135 $13,851 
(1) Included in Other current liabilities is $1.7 million related to the Repayment Agreement as defined in Note 10.
As of June 30, 2023 and December 31, 2022, the Mine reclamation liability related to the Five Forks Mine is included in Other long-term liabilities. As of December 31, 2022, the Mine reclamation liability related to Marshall Mine was included in Other current liabilities and Other long-term liabilities.
As part of the Arq Acquisition, the Company assumed asset retirement obligations related to two sites; a coal waste site adjacent to the Corbin Facility (the "Corbin ARO") and Mine 4 located in West Virginia (the "Mine 4 ARO"). The Company recorded these AROs at their estimated fair values and periodically adjusts them to reflect changes in the estimated present value resulting from the passage of time and revisions to the estimates of either the timing or amount of the reclamation costs. As of June 30, 2023, the Corbin ARO is included in Other long-term liabilities. As of June 30, 2023, the current portion of the Mine 4 ARO is included in Other current liabilities with the long-term portion included in Other long-term liabilities.
The Mine reclamation liabilities represent AROs and changes for the six months ended June 30, 2023 and year ended December 31, 2022 were as follows:
As of
(in thousands)June 30, 2023December 31, 2022
Asset retirement obligations, beginning of period$8,533 $9,959 
Asset retirement obligations assumed(1)
1,500 — 
Accretion303 611 
Liabilities settled(2)
(4,844)(2,071)
Changes due to scope and timing of reclamation— 34 
Asset retirement obligations, end of period5,492 8,533 
Less current portion169 548 
Asset retirement obligations, long-term$5,323 $7,985 
(1) Represents the Corbin ARO and Mine 4 ARO in the amounts of $0.5 million and $1.0 million, respectively.
(2) Represents the removal of the Marshall Mine ARO as a result of the MM Transaction as further discussed in Note 3.