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Additional Financial Statement Information (Tables) | 6 Months Ended
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Jun. 30, 2024
Additional Financial Statement Information |
Schedule of Other Balance Sheet information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | June 30, | December 31,
​ |  | 2024 | 2023
Other Receivables | ​ | ​ | ​ | ​ | ​ | ​
Insurance and Third Party Receivables for Remediation Expenses | ​ | $ | 4,342 | ​ | $ | 4,064
Reimbursable Research and Development Receivable | ​ | ​ | — | ​ | ​ | 1,450
Property Insurance Receivable | ​ | ​ | 2,337 | ​ | ​ | 4,000
Reimbursable Projects | ​ | ​ | 6,753 | ​ | ​ | 3,253
Total Other Receivables | ​ | $ | 13,432 | ​ | $ | 12,767
​ | ​ | ​ | ​ | ​ | ​ | ​
Prepaids and Deposits | ​ | ​ | ​ | ​ | ​ | ​
Prepaid Insurance | ​ | $ | 2,071 | ​ | $ | 5,494
Other Prepaids and Deposits | ​ | ​ | 3,318 | ​ | ​ | 2,870
Total Prepaids and Deposits | ​ | $ | 5,389 | ​ | $ | 8,364
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued and Other Current Liabilities | ​ | ​ | ​ | ​ | ​ | ​
Accrued Operating Expense | ​ | $ | 19,675 | ​ | $ | 33,491
Accrued Capital Costs | ​ | ​ | 7,500 | ​ | ​ | 3,812
Accrued Interest | ​ | ​ | 8,260 | ​ | ​ | 8,510
Accrued Compensation | ​ | ​ | 6,066 | ​ | ​ | 10,118
Sales Tax Payable | ​ | ​ | 2,949 | ​ | ​ | 1,645
Lease Liabilities | ​ | ​ | 1,763 | ​ | ​ | 1,676
Contingent Consideration Liability | ​ | ​ | 1,078 | ​ | ​ | 1,221
Other | ​ | ​ | 2,970 | ​ | ​ | 3,943
Total Accrued and Other Current Liabilities | ​ | $ | 50,261 | ​ | $ | 64,416
​ | ​ | ​ | ​ | ​ | ​ | ​
Other Long-Term Liabilities | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent Lease Liabilities | ​ | $ | 14,242 | ​ | $ | 14,716
Contingent Consideration Liability | ​ | ​ | 1,829 | ​ | ​ | 2,078
Total Other Long-Term Liabilities | ​ | $ | 16,071 | ​ | $ | 16,794
Schedule of Other Statement of Operations information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Depreciation, Amortization and Accretion Expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation - Property, Plant and Equipment | ​ | $ | 10,105 | ​ | $ | 9,335 | ​ | $ | 19,944 | ​ | $ | 18,197
Amortization - Intangible Assets | ​ | ​ | 9,264 | ​ | ​ | 9,451 | ​ | ​ | 18,527 | ​ | ​ | 18,903
Accretion of Asset Retirement Obligations | ​ | ​ | 338 | ​ | ​ | 300 | ​ | ​ | 657 | ​ | ​ | 592
Total Depreciation, Amortization and Accretion Expense | ​ | $ | 19,707 | ​ | $ | 19,086 | ​ | $ | 39,128 | ​ | $ | 37,692
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other Operating Expense (Income), Net | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loss on Disposal of Assets, Net | ​ | $ | 168 | ​ | $ | 70 | ​ | $ | 114 | ​ | $ | 57
Abandoned Projects | ​ | ​ | 16 | ​ | ​ | 128 | ​ | ​ | 745 | ​ | ​ | 128
Abandoned Well Costs | ​ | ​ | (25) | ​ | ​ | — | ​ | ​ | 310 | ​ | ​ | —
Transaction Costs | ​ | ​ | 89 | ​ | ​ | 100 | ​ | ​ | 96 | ​ | ​ | 145
Other | ​ | ​ | (116) | ​ | ​ | (490) | ​ | ​ | (218) | ​ | ​ | (305)
Other Operating Expense (Income), Net | ​ | $ | 132 | ​ | $ | (192) | ​ | $ | 1,047 | ​ | $ | 25
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest Expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest on Debt Instruments | ​ | $ | 8,596 | ​ | $ | 8,543 | ​ | $ | 16,897 | ​ | $ | 17,104
Amortization of Debt Issuance Costs | ​ | ​ | 763 | ​ | ​ | 608 | ​ | ​ | 1,529 | ​ | ​ | 1,218
Total Interest Expense | ​ | ​ | 9,359 | ​ | ​ | 9,151 | ​ | ​ | 18,426 | ​ | ​ | 18,322
Less: Capitalized Interest | ​ | ​ | (546) | ​ | ​ | (1,180) | ​ | ​ | (1,175) | ​ | ​ | (2,690)
Total Interest Expense, Net | ​ | $ | 8,813 | ​ | $ | 7,971 | ​ | $ | 17,251 | ​ | $ | 15,632
​

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