Annual report pursuant to Section 13 and 15(d)

Additional Financial Statement Information - Other Balance Sheet information (Details)

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Additional Financial Statement Information - Other Balance Sheet information (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Other Receivables    
Insurance and Third Party Receivables for Remediation Expenses $ 4,064 $ 3,600
Reimbursable Research and Development Receivable 1,450  
Property Insurance Receivable 4,000  
Reimbursable Projects and Other 3,253 754
Total Other Receivables 12,767 4,354
Prepaids and Deposits    
Prepaid Insurance 5,494 4,609
Other Prepaids and Deposits 2,870 1,196
Total Prepaids and Deposits 8,364 5,805
Accrued and Other Current Liabilities    
Accrued Operating Expense 33,491 28,877
Accrued Capital Costs 3,812 16,161
Accrued Interest 8,510 8,262
Accrued Compensation 10,118 4,809
Lease Liabilities $ 1,676 $ 1,176
Current Lease Liabilities, Classification Total Accrued and Other Current Liabilities Total Accrued and Other Current Liabilities
Asset Retirement Obligation $ 763 $ 2,242
Contingent Consideration Liability 1,221 1,350
Advance Billings for Reimbursable Research and Development Expense 1,120  
Other 3,705 2,534
Total Accrued and Other Current Liabilities 64,416 65,411
Other Long-Term Liabilities    
Noncurrent Lease Liabilities $ 14,716 $ 7,719
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Total Other Long-Term Liabilities Total Other Long-Term Liabilities
Contingent Consideration Liability $ 2,078 $ 2,702
Total Other Long-Term Liabilities $ 16,794 $ 10,421