Quarterly report pursuant to Section 13 or 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
Mar. 31, 2024
Dec. 31, 2023
Other Receivables    
Insurance and Third Party Receivables for Remediation Expenses $ 3,510 $ 4,064
Reimbursable Research and Development Receivable 227 1,450
Property Insurance Receivable 4,000 4,000
Reimbursable Projects and Other 3,347 3,253
Total Other Receivables 11,084 12,767
Prepaids and Deposits    
Prepaid Insurance 3,824 5,494
Other Prepaids and Deposits 2,526 2,870
Total Prepaids and Deposits 6,350 8,364
Accrued and Other Current Liabilities    
Accrued Operating Expense 25,335 33,491
Accrued Capital Costs 14,007 3,812
Accrued Interest 15,677 8,510
Accrued Compensation 4,419 10,118
Lease Liabilities $ 1,773 $ 1,676
Current Lease Liabilities, Classification Total Accrued and Other Current Liabilities Total Accrued and Other Current Liabilities
Asset Retirement Obligation $ 578 $ 763
Contingent Consideration Liability 1,261 1,221
Advance Billings for Reimbursable Research and Development Expense   1,120
Other 3,853 3,705
Total Accrued and Other Current Liabilities 66,903 64,416
Other Long-Term Liabilities    
Noncurrent Lease Liabilities $ 14,579 $ 14,716
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Total Other Long-Term Liabilities Total Other Long-Term Liabilities
Contingent Consideration Liability $ 1,844 $ 2,078
Total Other Long-Term Liabilities $ 16,423 $ 16,794