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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating loss carry-forwards $ 59,814 $ 28,398
Leases 14,208 14,809
Asset retirement obligations 2,827 2,972
Benefit plan obligations 1,017 978
Accruals and stock-based compensation 4,075 3,087
Other 7,441 5,767
Total gross deferred tax assets 89,382 56,011
Less valuation allowance (523) (619)
Net deferred tax assets 88,859 55,392
Deferred tax liabilities:    
Property, plant and equipment 146,302 109,852
Leases 13,616 14,541
Intangible assets 13,837 12,867
Prepaid assets and other 3,251 2,732
Total gross deferred tax liabilities 177,006 139,992
Net deferred tax liabilities $ 88,147 $ 84,600