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Supplemental Financial Information (Tables)
9 Months Ended
Sep. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expenses and Other Assets and Other assets
The following table summarizes the components of Prepaid expenses and other assets and Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets:
As of
(in thousands)September 30,
2021
December 31,
2020
Prepaid expenses and other assets:
Prepaid expenses$2,370 $1,690 
Prepaid income taxes and income tax refunds1,038 1,605 
Other1,206 1,302 
$4,614 $4,597 
Other long-term assets, net:
Cabot Receivable (1)$6,812 $8,852 
Upfront Customer Consideration (1)7,109 7,490 
Mine development costs, net5,291 4,338 
Right of use assets, operating leases, net6,399 1,930 
Spare parts, net4,316 3,727 
Mine reclamation asset, net1,644 1,712 
Highview Investment552 552 
Other 1,278 1,388 
$33,401 $29,989 
(1) See further discussion of Upfront Customer Consideration in Note 3 and Cabot Receivable in Note 4 and Note 10.
Schedule of Other Liabilities
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)September 30,
2021
December 31,
2020
Other current liabilities:
Current portion of operating lease obligations$2,289 $1,883 
Current portion of mine reclamation liability4,856 9,370 
Income and other taxes payable2,409 1,305 
Other current liabilities312 438 
$9,866 $12,996 
Other long-term liabilities:
Mine reclamation liabilities$8,028 $12,077 
Operating lease obligations, long-term4,582 1,109 
Other long-term liabilities208 287 
$12,818 $13,473 
Schedule of Change in Asset Retirement Obligation
The Mine reclamation liability related to the Five Forks Mine is included in Other long-term liabilities. The Mine reclamation liability related to Marshall Mine, which was assumed in the Marshall Mine Acquisition, is included in Other current liabilities and Other long-term liabilities. The Mine reclamation liabilities represent AROs. Changes in the AROs were as follows:
As of
(in thousands)September 30, 2021December 31, 2020
Asset retirement obligation, beginning of period$21,447 $2,721 
Asset retirement obligation assumed— 21,328 
Accretion901 543 
Liabilities settled(7,522)(3,565)
Changes due to scope and timing of reclamation(1,942)420 
Asset retirement obligations, end of period12,884 21,447 
Less current portion4,856 9,370 
Asset retirement obligation, long-term$8,028 $12,077 
Schedule of Statement of Operations, Supplemental Disclosures
The following table details the components of Interest expense in the Condensed Consolidated Statements of Operations:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Interest on Senior Term Loan$— $339 $207 $1,453 
Debt discount and debt issuance costs— 355 946 1,064 
453A interest94 10 254 
Other83 93 253 282 
$86 $881 $1,416 $3,053